Acting director of the White House budget office Russell Vought said in a letter that the cost estimate to build and fly a single NASA large Space Launch System rocket in a given year is "more than $2 billion." "The article then notes how this cost is affecting the Europa Clipper mission, which has three launch options, with SLS mandated by Congress," writes Slashdot reader schwit1. From the report: The powerful SLS booster offers the quickest ride for the six-ton spacecraft to Jupiter, less than three years. But for mission planners, there are multiple concerns about this rocket beyond just its extraordinary cost. There is the looming threat that the program may eventually be canceled (due to its cost and the emergence of significantly lower cost, privately built rockets). NASA's human exploration program also has priority on using the SLS rocket, so if there are manufacturing issues, a science mission might be pushed aside. Finally, there is the possibility of further developmental delays -- significant ground testing of SLS has yet to begin.

Another option is United Launch Alliance's Delta IV Heavy rocket, which has an excellent safety record and has launched several high-profile missions for NASA. However, this rocket requires multiple gravity assists to push the Clipper into a Jupiter orbit, including a Venus flyby. This heating would add additional thermal constraints to the mission, and scientists would prefer to avoid this if at all possible. A final possibility is SpaceX's Falcon Heavy rocket, with a kick stage. This booster would take a little more than twice as long as the SLS rocket to get the Clipper payload to Jupiter, but it does not require a Venus flyby and therefore avoids those thermal issues. With a track record of three successful flights, the Falcon Heavy also avoids some of the development and manufacturing concerns raised by SLS vehicle. Finally, it offers the lowest cost of the three options.

A bipartisan group of senators has filed a new bill that sets out space policy for NASA over the coming decade. "The new authorizing legislation is largely consistent with much of NASA's present activities, but it differs from White House policy in some key respects," reports Ars Technica. "Most notably, the legislation calls for NASA to support the International Space Station through 2030." From the report: The Trump administration has sought to commercialize space stations in low Earth orbit by 2025, perhaps by becoming a customer on a privately operated International Space Station or by supporting the development of smaller, private labs. "By extending the ISS through 2030, this legislation will help grow our already burgeoning space economy, fortifying the United States' leadership in space, increasing American competitiveness around the world, and creating more jobs and opportunity here at home," said Sen. Ted Cruz, a Texas Republican who chairs a subcommittee on space and aviation, in a news release.

Cruz was joined by three other senators in introducing the NASA Authorization Act of 2019: the subcommittee's ranking member, Kyrsten Sinema (D-Ariz.), as well as Sens. Roger Wicker (R-Miss.) and Maria Cantwell (D-Wash.), who are chairman and ranking member of the Senate Committee on Commerce, Science, and Transportation, respectively. The new legislation follows the NASA Transition Authorization Act of 2017, which Cruz also led and which President Trump signed into law in March 2017. However, almost immediately after that bill became a law, Cruz characterized it as an interim measure to steady NASA through the presidential transition. The new bill is intended as a more expansive view of space policy, and it encompasses the Trump administration's Artemis Program to land humans on the Moon.

Smithsonian magazine reports on a new study that concluded it may be possible to grow agricultural crops right in the soil of Mars -- and on the moon. For their paper in the journal Open Agriculture, researchers from Wageningen University & Research in the Netherlands planted ten different earthly crops in three types of soil. One was typical, garden-variety potting soil, another was simulated lunar dust, and a third was simulated Martian soil... Each Friday of the experiment, they added a nutrient-rich solution created to mimic the addition of human manure and urine that astro-colonists would likely add to their lunar farms. The crops planted in the soils included garden cress, rocket (aka arugula), tomato, radish, rye, quinoa, spinach, chives, peas and leeks.

Of those, the only vegetable that failed to grow well in the exo-soils was spinach. The radishes, cress and rye all grew to a point where seeds could be harvested. The team was also able to harvest tomatoes and peas from the lunar and Martian soils. The chives and leeks grew steadily, but slower than normal. While the quinoa produced flowers, it did not produce seeds. Still, the team reports that they suspect this is the first time any plants have been grown large enough to produce fruit in the soil simulants.

In a follow-up, the team were able to germinate the radish, cress and rye seeds produced on the Mars and lunar soils, suggesting that the production of self-sustaining crops might be possible in space.

NASA will send a golf cart-sized robot to the moon in 2022 to search for deposits of water below the surface, an effort to evaluate the vital resource ahead of a planned human return to the moon in 2024 to possibly use it for astronauts to drink and to make rocket fuel, the U.S. space agency said on Friday. From a report: The VIPER robot will drive for miles (km) on the dusty lunar surface to get a closer look at what NASA administrator Jim Bridenstine has touted for months: underground pockets of "hundreds of millions of tons of water ice" that could help turn the moon into a jumping-off point to Mars. "VIPER is going to assess where the water ice is. We're going to be able to characterize the water ice, and ultimately drill," Bridenstine said on Friday at the International Astronautical Congress in Washington. "Why is this important? Because water ice represents something significant. Life support." VIPER stands for Volatiles Investigating Polar Exploration Rover.

Astronomers have spotted 20 more moons orbiting Saturn, bringing the total number of Saturnian moons to 82, surpassing the 79 that are known to orbit Jupiter. The Guardian reports: The scientists discovered the moons when they set algorithms to work on decade-old images captured from the powerful Subaru telescope on Mauna Kea in Hawaii. By comparing images taken over hours and days, the algorithms distinguished between stationary stars and galaxies and moons that hurtled around the planet. Depending on the angle of approach, comets and asteroids straying too close to Saturn in the early solar system would have become locked into radically different orbits around the planet. Only three of the new moons have so-called prograde orbits, meaning they circle Saturn in the same direction that it rotates. The other 17 are in retrograde orbits, meaning they orbit the planet backwards. One is the most distant moon ever spotted from the planet.

The outer moons of Saturn fall into three broad families according to how they orbit the gas giant. Two of the new prograde moons appear to belong to a group that swings around Saturn at an angle of about 46 degrees. The moons, named after Inuit mythology, may once have belonged to one far larger moon that broke apart in the distant past. The new retrograde moons appear to belong to another group named after Norse mythology and are also thought to be fragments of a much bigger parent moon that was smashed to pieces in the solar system's violent past.

A man has been able to move all four of his paralyzed limbs with a mind-controlled exoskeleton suit, French researchers report. From a report: Thibault, 30, said taking his first steps in the suit felt like being the "first man on the Moon." His movements, particularly walking, are far from perfect and the robo-suit is being used only in the lab. But researchers say the approach could one day improve patients' quality of life. Thibault had surgery to place two implants on the surface of the brain, covering the parts of the brain that control movement.

Sixty-four electrodes on each implant read the brain activity and beam the instructions to a nearby computer. Sophisticated computer software reads the brainwaves and turns them into instructions for controlling the exoskeleton. Thibault has to be strapped into the exoskeleton. And he can control each of the arms, maneuvering them in three-dimensional space.

Scientists have detected new types of organic compounds in the plumes that have been erupting from Saturn's icy moon Enceladus. Space.com reports: NASA's Cassini spacecraft collected invaluable data and images of Saturn and its moons over the approximately 20 years that the mission took place. While the mission ended on Sept. 15, 2017, with the craft diving toward the planet in a "Grand Finale," scientists continue to study the wealth of data that they gathered during the mission. In one new study, scientists looked at the material that Enceladus ejects from its core using hydrothermal vents. The material mixes with water in the moon's subsurface ocean and is then emitted as water vapor and icy grains.

In studying these ejections, the team found organic molecules that are condensed onto these grains and which contain oxygen and nitrogen. This comes after the first discovery of organics on the moon in 2018. Similar compounds on Earth take part in the chemical reactions that form amino acids, which are the organic compounds that combine to form proteins and are essential to life as we know it. On Earth, energy, or heat, from hydrothermal vents on the ocean floor helps to fuel these amino acid-producing reactions. With these findings, scientists have suggested that perhaps something similar is happening on Enceladus and the hydrothermal vents under its subsurface ocean are aiding in the creation of amino acids on the moon. "If the conditions are right, these molecules coming from the deep ocean of Enceladus could be on the same reaction pathway as we see here on Earth. We don't yet know if amino acids are needed for life beyond Earth, but finding the molecules that form amino acids is an important piece of the puzzle," Nozair Khawaja, who led the research team from the Free University of Berlin, said in a statement.

The team behind a pioneering biological experiment sent to the lunar far side has released an image showing two green leaves grown on the moon. From a report: The experiment began shortly after China's Chang'e-4 spacecraft made the first ever landing on the far side of the moon, on 3 January this year. Cotton, arabidopsis and potato seeds, and fruit-fly eggs and yeast were all aboard the 2.6-kilogram mini biosphere, but only the cotton produced positive results. Image processing has now shown that two cotton leaves had grown -- rather than just one as initially thought -- in what was the first biological growth experiment on the moon. All the species died with the onset of the first lunar night, with no power to protect the canister from temperatures that reached as low as minus 190 degrees Celsius. The cotton leaves were dead within one lunar daytime, or around 14 and a half Earth days. The experiment continued until May, however, in order to test the longevity of the apparatus. The Chang'e-4 lander and rover meanwhile have just started their tenth lunar daytime in Von Karman crater.

Elon Musk has laid out an ambitious future for his spaceship project, the effort to deliver people to the moon and Mars. Marina Koren, writing for The Atlantic: The whole thing felt like an Apple event. The weeks of anticipation and breathless guesses from fans and critics. Onstage, the greatest-hits reel highlighting the company's beloved products over the years. A grand walk-through of the next product's features: the sleek design, the impressive specs, simulations of how it's going to work. A man with a mic, both salesman and visionary, looking out at the crowd. It is strange to compare the unveiling of a spaceship to the annual release of a smartphone, but this is the reality Elon Musk has conjured with SpaceX, and in a relatively short amount of time.

Musk gave a talk about SpaceX's prototype spaceship, Starship, on Saturday night in Boca Chica, Texas, a small coastal town not far from the U.S.-Mexico border, which SpaceX picked to house this ambitious project just a few years ago. The vessel, roomy enough to fit 100 passengers, will be shot into orbit by a massive, reusable rocket, which the company is also building and which could be as powerful as the Saturn V rocket that launched Apollo astronauts. Starship has multiple missions; it is supposed to shuttle people on swift journeys to different cities on Earth, as well as carry them on long-haul flights to the moon and Mars.

The event came 11 years after SpaceX reached orbit for the first time with the earliest version of its Falcon rockets. Since then, the company has flown rockets to orbit over and over again, then landed the accompanying boosters upright on the ground and reused them, an industry first for orbital missions. The company has launched commercial satellites, government spy missions, and cargo to the International Space Station. It shot a Tesla toward Mars and sprinkled internet satellites around Earth. Musk founded SpaceX to someday send people to Mars, and he has said for years that he will make space travel as easy as hopping on a plane. As he stood in front of a gleaming steel spaceship, it was tempting to start believing him. "It's really gonna be pretty epic to see that thing take off and come back," Musk said.

NASA engineers want to create a rocket engine powered by nuclear fusion. "A nuclear rocket engine would be twice as efficient as the chemical engines powering rockets today," reports Wired. "But despite their conceptual simplicity, small-scale fission reactors are challenging to build and risky to operate because they produce toxic waste. Space travel is dangerous enough without having to worry about a nuclear meltdown. But for future human missions to the moon and Mars, NASA believes such risks may be necessary." From the report: At the center of NASA's nuclear rocket program is Bill Emrich, the man who literally wrote the book on nuclear propulsion. "You can do chemical propulsion to Mars, but it's really hard," says Emrich. "Going further than the moon is much better with nuclear propulsion." Emrich has been researching nuclear propulsion since the early '90s, but his work has taken on a sense of urgency as the Trump administration pushes NASA to put boots on the moon ASAP in preparation for a journey to Mars. Although you don't need a nuclear engine to get to the moon, it would be an invaluable testing ground for the technology, which will almost certainly be used on any crewed mission to Mars.

Let's get one thing clear: A nuclear engine won't hoist a rocket into orbit. That's too risky; if a rocket with a hot nuclear reactor blew up on the launch pad, you could end up with a Chernobyl-scale disaster. Instead, a regular chemically propelled rocket would hoist a nuclear-powered spacecraft into orbit, which would only then fire up its nuclear reactor. The massive amount of energy produced by these reactors could be used to sustain human outposts on other worlds and cut the travel time to Mars in half. [...] But before a nuclear rocket engine gets its first flight, NASA needs to overhaul its regulations for launching nuclear materials. In August, the White House issued a memo that tasked NASA with developing safety protocols for operating nuclear reactors in space. Once they're adopted by NASA, the stage will be set for the first flight of a nuclear engine as soon as 2024. This coincides with Trump's deadline to return American astronauts to the moon; maybe this time they'll be hitching a ride on a nuclear rocket.

An anonymous reader shares a report: In a paper [PDF] published on the online research archive arXiv, Columbia astronomy students Zephyr Penoyre and Emily Sandford proposed the idea of a "lunar space elevator," which is exactly what it sounds like -- a very long elevator connecting the moon and our planet. The concept of a moon elevator isn't new. In the 1970s, similar ideas were floated in science fiction (Arthur C. Clarke's The Fountains of Paradise, for example) and by academics like Jerome Pearson and Yuri Artsutanov. But the Columbia study differs from previous proposal in an important way: instead of building the elevator from the Earth's surface (which is impossible with today's technology), it would be anchored on the moon and stretch some 200,000 miles toward Earth until hitting the geostationary orbit height (about 22,236 miles above sea level), at which objects move around Earth in lockstep with the planet's own rotation.

Dangling the space elevator at this height would eliminate the need to place a large counterweight near Earth's orbit to balance out the planet's massive gravitational pull if the elevator were to be built from ground up. This method would also prevent any relative motion between Earth's surface and space below the geostationary orbit area from bending or twisting the elevator. These won't be problems for the moon because the lunar gravitational pull is significantly smaller and the moon's orbit is tidally locked, meaning that the moon keeps the same face turned toward Earth during its orbit, therefore no relative motion of the anchor point.

80 minutes from now, an asteroid will pass so close to earth that home astronomers will be able to see it, writes Salon.

Slashdot reader PolygamousRanchKid shares their report: Experts say the asteroid, known as Asteroid 2000 QW7, will miss our planet by about 3 million miles -- around 14 times the distance between the Earth and the moon. And while that distance is astonishingly close on an astronomical scale, it does not suggest that the asteroid is going to hit Earth -- although it has a small chance to strike our planet in the future. The closeness of its pass on Saturday will allow astronomers to hone their measurements of its trajectory, allowing for more accurate calculations of its strike probability in the future.

Gianluca Masi, Scientific Director at The Virtual Telescope, told Salon in a statement that amateur astronomers can view its fly-by, which is at 7:54 pm on the East Coast, but will have to have a telescope with a diameter of at least 250 millimeters. [Heres' the telescope-positioning coordinates.] Masi said a smaller telescope might work if combined with a sensitive imaging device that can also record its apparent motion across the stars...

NASA released a statement this week to the public to emphasize it is not a threat, noting that it is actually one of two asteroids to pass Earth this weekend. The second asteroid, asteroid 2010 C01, is estimated to be 120 to 260 meters in size (400 to 850 feet).
The first asteroid's diamter is between 300 and 600 meters -- so up to 1968 feet, or a little more than one-third of a mile.

The remains of a man who went missing two decades ago in Florida have been found in a submerged car visible on Google Maps. The BBC reports: William Moldt, 40, was reported missing from Lantana, Florida, on November 7, 1997. He failed to return home from a night out at a club when he was 40 years old. A missing person investigation was launched by police but the case went cold. On August 28 this year -- 22 years on -- police were called to reports of a car found in a pond in Moon Bay Circle, Wellington.

When the vehicle was pulled from the water, skeletal remains were found inside. One week later the remains were positively identified as belonging to Mr Moldt. A report by the Charley Project, an online database of cold cases in the U.S., said "a property surveyor saw the car while looking at Google Earth." "Amazingly, a vehicle had plainly [been] visible on a Google Earth satellite photo of the area since 2007, but apparently no-one had noticed it until 2019," according to the report. What appears to be a silver car submerged in the pond can still be viewed on Google Maps.

Using radar data from NASA's Cassini spacecraft, recently published research presents a new scenario to explain why some methane-filled lakes on Saturn's moon Titan are surrounded by steep rims that reach hundreds of feet high. The models suggests that explosions of warming nitrogen created basins in the moon's crust. Phys.Org reports: Titan is the only planetary body in our solar system other than Earth known to have stable liquid on its surface. But instead of water raining down from clouds and filling lakes and seas as on Earth, on Titan it's methane and ethane -- hydrocarbons that we think of as gases but that behave as liquids in Titan's frigid climate. Most existing models that lay out the origin of Titan's lakes show liquid methane dissolving the moon's bedrock of ice and solid organic compounds, carving reservoirs that fill with the liquid. This may be the origin of a type of lake on Titan that has sharp boundaries. On Earth, bodies of water that formed similarly, by dissolving surrounding limestone, are known as karstic lakes.

The new, alternative models for some of the smaller lakes (tens of miles across) turns that theory upside down: It proposes pockets of liquid nitrogen in Titan's crust warmed, turning into explosive gas that blew out craters, which then filled with liquid methane. The new theory explains why some of the smaller lakes near Titan's north pole, like Winnipeg Lacus, appear in radar imaging to have very steep rims that tower above sea level -- rims difficult to explain with the karstic model. The work, published Sept. 9 in Nature Geosciences, meshes with other Titan climate models showing the moon may be warm compared to how it was in earlier Titan "ice ages."

An anonymous reader quotes Space.com: India's Chandrayaan-2 orbiter attempted to drop a lander named Vikram near the lunar south pole yesterday afternoon (Sept. 6), but mission controllers lost contact with the descending craft when it was just 1.3 miles (2.1 kilometers) above the gray dirt. As of early Saturday morning (Sept. 7), the Indian Space Research Organisation (ISRO) still had not officially declared Vikram dead. But comments by Indian Prime Minister Narendra Modi leave little room for optimism...

But Chandrayaan-2's journey isn't over yet, because the orbiter is still going strong. In fact, its yearlong moon mission has barely begun; the spacecraft slipped into lunar orbit just last month. Since then, the Chandrayaan-2 orbiter has been studying Earth's natural satellite with eight different science instruments, from an altitude of 62 miles (100 kilometers). The probe's data should eventually allow researchers to compile detailed maps of the lunar surface, revealing key insights about the moon's elemental composition, formation and evolution, ISRO officials have said.

Some of these maps will attempt to assess the moon's stores of water ice. A decade ago, Chandrayaan-2's predecessor, the orbiter Chandrayaan-1, showed that water is widespread across the lunar surface, especially at the poles... Vikram was supposed to deploy a rover named Pragyan, which would have mapped out the elemental composition of the landing site, potentially providing up-close information about ice in the area.

India's first soft landing on the Moon today appears to have ended in failure after the country's robotic Vikram lander seemingly crashed into the lunar surface during its powered descent to the ground. The Verge reports: India would have become the fourth country to land a spacecraft intact on the Moon. But for now, only the United States, Russia, and China hold that title. The Vikram lander was a critical part of India's Chandrayaan-2 mission -- a project aimed at learning more about the unexplored and highly intriguing south pole of the Moon. Numerous lunar spacecraft have gathered enough evidence about this region to suggest that significant amounts of water ice might be hiding on the south pole, likely in frigid craters that are in permanent shadow. India's goal with Chandrayaan-2 was to land vehicles in this region to get a better understanding of the area's composition and learn just how much water ice might be lurking there.

Vikram was carrying a rover called Pragyan, and together the two vehicles were meant to explore the south pole region in up-close detail using a series of instruments, including a seismometer to measure lunar quakes and X-rays to help figure out the composition of the dirt (and potential water ice). But just a few minutes before Vikram was scheduled to touch down on the Moon, data of the lander from inside India's mission control center showed the vehicle to be slightly off course. When Vikram was about 1.3 miles (2.1 kilometers) above the surface, India lost communication with the lander. India has yet to give official confirmation on whether or not the lander did, indeed, crash.

It's a big day for India's highly audacious Chandrayaan-2 mission. From a report: The nation will attempt to land its lunar orbit on the moon's surface shortly as it inches closer to become the fourth in the world to complete a successful lunar landing. ISRO, India's equivalent of NASA, is live streaming the landing on its website, and YouTube channel. The landing is scheduled for between 1pm and 2pm Pacific Time (4pm to 5pm Eastern Time; 8pm to 9pm GMT). ISRO launched its 142 feet tall spacecraft from the the Satish Dhawan Space Centre, Sriharikota in Andhra Pradesh on July 15. The spacecraft consists of an orbiter, a lander named Vikram (named after Vikram Sarabhai, the father of India's space program), and a six-wheeled rover named Pragyaan (Sanskrit for "wisdom"). Earlier this week, the lander that carried the rover detached from the orbiter. The mission's budget is just $141 million, significantly lower than those of other countries, and less than half of the recently released blockbuster "Avengers: Endgame."

pacopico writes: Aerospace technology has gotten better. The price of rocket launches has come down. So much so that a group of space friends in Silicon Valley now think it's possible to create their own settlement on the moon for less than $3 billion. They've formed a non-profit called the Open Lunar Foundation that looks to begin launching probes to the lunar surface and then to start work on a habitat. The idea is to build a settlement in the spirit of open-source technology where data and hardware designs can be shared and where policies around the settlement are shaped by people all over the world rather than a particular nation state or billionaire. So far the team is small and working off a few million dollars, but there's an all-star cast of advisors, including former astronauts, NASA heads and aerospace execs.

An anonymous reader quotes CNET: China's Yutu-2 rover, launched as part of the Chang'e 4 mission, is the first-ever robot to explore the far side of the moon. Since landing in January, it's snapped gorgeous views of the lunar surface and made one unexpected discovery. Now, it's made another surprising find: an unusual substance with a "gel-like" appearance hidden inside a crater...

Three days into day 8, a member of the Chang'e 4 team was reviewing images taken during by the rover and noticed a strangely colored material, distinct from the gray soil around it. So, the team instead turned its attention toward the substance and sent the rover towards the crater for a better look. The Yutu-2 "drive diary" says the team commanded the rover to point its spectrometer, a device which can evaluate the composition of materials, towards the unusual substance. The team didn't indicate what the substance might be and they haven't shared an image of the weird material. The team did, however, share an image of the rover heading for the crater to have a gander at what's inside.

I know you're thinking aliens but Andrew Jones, a journalist reporting on the Chinese space program, wrote that one possible explanation is that the gel-like substance is melted glass, created after a meteor strike.

Long-time Slashdot reader William Robinson writes: An unmanned spacecraft, Chandrayaan 2, India launched last month has begun orbiting the moon before it lands on the far side to search for water. The spacecraft is in orbit of 114 km x 18072 km and will continue circling the moon in a tighter orbit until reaching a distance of about 100 km x 30 km from the moon's surface. "The lander will then separate from the orbiter and use rocket fuel to brake as it attempts to land in the south polar region of the moon on Sept. 7 -- an area where no moon landing has been attempted before," reports CTV News. The mission is carrying a total of 14 payloads -- 13 Indian and one passive payload from NASA -- with special focus of the orbiter on mapping craters in the polar region, besides checking for water again.
Space.com shares the first photo of the moon snapped by the spacecraft on Wednesday, noting that "If the lander safely touches down, India will become the fourth country to complete that feat, after the Soviet Union, the U.S. and China.

"The lander and rover would operate for one lunar day but are not designed to withstand the frigid lunar nights."