Month: March 2023

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Study documents satellite interference with Hubble

Satellite streaks on Hubble images
Satellite streaks cross these images from the Hubble Space Telescope. (NASA / ESA / STScI / Kruk et al. / Nature)

An analysis of more than 100,000 images from the Hubble Space Telescope, conducted with the aid of artificial intelligence and hundreds of human volunteers, confirms that satellites including SpaceX’s Starlink spacecraft are increasingly interfering with astronomical observations.

The images used in the study, which is the subject of a paper published today by Nature Astronomy, largely predate the deployment of Starlink broadband internet satellites. But the trend line suggests that more and more satellites will cause more and more interference.

“This is an attempt to define a baseline before the swarm of artificial satellites for future follow-up studies of the impact of megaconstellations on space-based astronomy,” said the research team, which is led by Sandor Kruk of the Max Planck Institute for Extraterrestrial Physics in Germany.

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GeekWire

Hydrogen-powered plane aces its first flight

Universal Hydrogen plane in flight
Universal Hydrogen’s prototype plane takes flight in Moses Lake, Wash., in March 2023. (Universal Hydrogen Photo)

A prototype aircraft with a hydrogen-fueled powertrain successfully completed an initial 15-minute flight today at Grant County International Airport in Moses Lake, Wash., marking a significant step for zero-emission aviation.

Los Angeles-based Universal Hydrogen had the 40-passenger De Havilland Dash 8-300 turboprop converted to use hydrogen to power an electric propulsion system mounted on the plane’s right wing. The system incorporates a fuel cell built by Plug Power and a megawatt-class motor built by Everett, Wash.-based MagniX. Seattle-based AeroTEC assisted with the engineering for the conversion.

The engine on the left side was left unconverted to serve as a backup in case the hydrogen-based system encountered problems.

Universal Hydrogen and its partners worked in Moses Lake for months to get the plane — nicknamed Lightning McClean — ready for today’s first aerial tryout, conducted under the conditions of an experimental airworthiness certificate from the Federal Aviation Administration.

The flight began at 8:41 a.m. PT and reached a maximum altitude of 3,500 feet. “We were able to throttle back the fossil-fuel turbine engine to demonstrate cruise principally on hydrogen power,” test pilot Alex Kroll said in a news release. “The airplane handled beautifully, and the noise and vibrations from the fuel cell powertrain are significantly lower than from the conventional turbine engine.”

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Cosmic Science

Hidden passage discovered within Egypt’s Great Pyramid

Hidden passage
Endoscopic imagery shows a hidden passage within the Great Pyramid of Giza. (ScanPyramids / Egyptian Min. of Tourism and Antiquities)

Archaeologists have discovered a long-lost passageway within Egypt’s 4,500-year-old Great Pyramid of Giza, thanks to 21st-century technologies including muon tomography and endoscopy.

It’s the latest find made possible with the help of ScanPyramids, an international effort that started documenting Egypt’s best-known archaeological sites with high-tech tools in 2015.

Over the past eight years, ScanPyramids’ team has identified several voids within the Great Pyramid. The passageway described today lies just beneath the pyramid’s north face, about 23 feet (7 meters) above the main entrance. It’s 30 feet (9 meters) long, about 7 feet (2.1 meters) wide, and high enough for a person to stand in.

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