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Airbus Promised a 'Green' Hydrogen Aircraft. That Bet Is Now Unraveling

2 months 2 weeks ago
An anonymous reader shared this report from the Wall Street Journal: Five years ago, Airbus made a bold bet: The plane maker would launch a zero-emissions, hydrogen-powered aircraft within 15 years that, if successful, would mark the biggest revolution in aviation technology since the jet engine. Now, Airbus is pulling the brakes. The company has cut the project's budget by a quarter, reallocated staff and sent remaining engineers back to the drawing board, delaying its plans by as much as a decade... Airbus has spent more than $1.7 billion on the project, according to people familiar with the matter, but over the past year concluded that technical challenges and a slow uptake of hydrogen in the wider economy meant the jet wouldn't be ready by 2035... Airbus says the past five years of work and money haven't been wasted. The company has established that hydrogen is technically feasible and delaying the project will give it more time to fine-tune the technology, executives said... Airbus shifted focus to hydrogen-fuel cells, which use a chemical reaction to generate energy for an electric motor. It would produce only water vapor, but would require a more radical redesign of the airframe and propulsion system. The plane would carry only 100 passengers about 1,000 nautical miles. Over time, even that proved challenging because of the extra weight of the fuel cells and their limited electricity generation. Instead of a short-haul narrow-body — the workhorse of the aviation industry — at best the aircraft would be more akin to a less appealing regional turboprop. Airbus received a multi-billion Covid-era support package from the French government that "required Airbus to spend a portion of the money on bringing green aircraft to market by the 2030s," according to the article. "The hydrogen project helped Airbus access additional government funding, as well as private green financing... Airbus ultimately assigned the project an annual budget of about €400 million, primarily funded through its own coffers, according to people familiar with its financing arrangements."

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EditorDavid

Astronomers Confirm First 'Lone' Black Hole Discovery - and It's in the Milky Way

2 months 2 weeks ago
For the first time, astronomers have confirmed the existence of a lone black hole," reports Science News — "one with no star orbiting it." It's "the only one so far," says Kailash Sahu, an astronomer at the Space Telescope Science Institute in Baltimore. In 2022, Sahu and his colleagues discovered the dark object coursing through the constellation Sagittarius. A second team disputed the claim, saying the body might instead be a neutron star. New observations from the Hubble Space Telescope now confirm that the object's mass is so large that it must be a black hole, Sahu's team reports in the April 20 Astrophysical Journal.... [And that second team has revised its assessment and now agrees: the object is a black hole.] While solitary black holes should be common, they are hard to find. The one in Sagittarius revealed itself when it passed in front of a dim background star, magnifying the star's light and slowly shifting its position due to the black hole's gravity. This passage occurred in July 2011, but the star's position is still changing. "It takes a long time to do the observations," Sahu says. "Everything is improved if you have a longer baseline and more observations." The original discovery relied on precise Hubble measurements of star positions from 2011 to 2017. The new work incorporates Hubble observations from 2021 and 2022 as well as data from the Gaia spacecraft. The upshot: The black hole is about seven times as massive as the sun, give or take 0.8 solar masses.... Located 5,000 light-years from Earth, this black hole is much closer than the supermassive one at the Milky Way's center, which also lies in Sagittarius but about 27,000 light-years from us. The star-rich region around the galactic center provides an ideal hunting ground for solitary black holes passing in front of stars. Sahu hopes to find additional lone black holes by using the Nancy Grace Roman Space Telescope, slated for launch in 2027.

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EditorDavid