As he spoke about the heightened risk, the NASA administrator also emphasized that both the space station and the astronauts aboard it are safe. The station can be maneuvered out of harm’s way if needed, he added.
But another danger, he said, is that “when one country does it, then other countries feel like they have to do it, as well.”
Source: NASA: Debris From India’s Anti-Satellite Test Raised Threat To Space Station : NPR
On February 21, the first mission of the Moonrush embarked aboard a Falcon 9 rocket. The Beresheet lunar lander built by Israel’s SpaceIL was launched as a secondary payload, sharing the ride with the Indonesian communications satellite PSN-6. After reaching geostationary transfer orbit, Beresheet and the communications satellite separated from the Falcon 9 launcher. The communications satellite will propel itself to geostationary Earth orbit. Meanwhile, Beresheet is slowly raising its orbit. In early April the spacecraft will enter lunar orbit, then land on the Moon.
Source: The Space Review: The Moonrush has begun
“New Horizons is like a time machine, taking us back to the birth of the solar system. We are seeing a physical representation of the beginning of planetary formation, frozen in time,” said Jeff Moore, New Horizons Geology and Geophysics team lead. “Studying Ultima Thule is helping us understand how planets form — both those in our own solar system and those orbiting other stars in our galaxy.”
Source: New Horizons: News Article?page=20190102
In the prototype plane, wires at the leading edge of the wing have 600 watts of electrical power pumped through them at 40,000 volts. This is enough to induce “electron cascades”, ultimately charging air molecules near the wire. Those charged molecules then flow along the electrical field towards a second wire at the back of the wing, bumping into neutral air molecules on the way, and imparting energy to them. Those neutral air molecules then stream out of the back of the plane, providing thrust.
Source: First ever plane with no moving parts takes flight | Science | The Guardian
The new approach comes with a snappy name: chiplets. You can think of them as something like high-tech Lego blocks. Instead of carving new processors from silicon as single chips, semiconductor companies assemble them from multiple smaller pieces of silicon—known as chiplets.
Source: To Keep Pace With Moore’s Law, Chipmakers Turn to ‘Chiplets’ | WIRED
Above a certain temperature, it becomes possible to replace the steam with supercritical carbon dioxide. This works more efficiently, potentially providing a boost of more than 20 percent, but it requires temperatures in excess of 1,000K. That makes things a bit more challenging, given that many metals will melt at such temperatures; others will react with carbon dioxide under these conditions. Finding a material that could work involves balancing a lot of factors, including heat and chemical resistance, ea
Source: New material could up efficiency of concentrated solar power | Ars Technica
NASA’s strong preference is to keep astronauts aboard the station. But Todd said NASA does have procedures for operating the station without crew on board. “That’s something that we’re always prepared for,” he said. “I feel very confident that we could fly for a significant period of time.”
Source: On Thursday a rocket failed. Three humans remain on the ISS. What’s next? | Ars Technica
The RemoveDEBRIS satellite consists of a large, 220-pound main satellite that carries two smaller cubesats and a net. The mission involves deploying these cubesats as artificial space junk and them capturing them to demonstrate the effectiveness debris removal technology. The first cubesat was successfully captured on Sunday evening with a net after six years of testing the technology on Earth.
Source: Watch This Net Capture Orbital Space Debris for the First Time in History – Motherboard
The problem is that the 60-to-90-foot-long friction piles underpinning the building were driven into sandy soils rather than bedrock at 200 feet down. While no concrete explanation has been given for continued sinkage, developer Millennium Partners has blamed construction of the neighboring Salesforce Tower for pumping out too much groundwater and causing the soil to settle.
Source: San Francisco threatens to block access to Millennium Tower – Archpaper.com
For decades, China’s growth was driven by shifting workers from agriculture to manufacturing. As the country started to approach the so-called Lewis turning point, when such shifts no longer raise overall productivity, the government made an increasingly concerted effort to build the scientific base to provide another vector for growth. The results of those efforts are showing up in both the rankings of Chinese universities (11 of the top 100 globally) and in scholarly output.
Source: Chinese Researchers Are Outperforming Americans in Science – Bloomberg