Once upon a time, a rock the size of Connecticut exploded in the atmosphere, showering Earth with bits of debris so numerous that they’ve skewed our expectation of what the solar system was like back then. Finding meteorites older than this would resolve the problem, but the Earth’s surface is so riddled with bits of debris from this one explosion, scientists have described trying to find meteorites from anywhere else as “like finding a needle in a haystack.”
So how do you find a needle in a haystack? You can spend some hours sifting through it piece by piece. Or, you can. Cosmochemist Philipp Heck dissolved a rock in strong acid to liberate the tiny, crystalline bits of ancient asteroid within. They’re from before the big debris shower, which means that their chemical composition stands to explain why the meteorites on Earth aren’t made of quite the same stuff as the asteroid belt.
My favorite busy bees at NASA have been hard at work, as per usual. They’ve been collaborating with the ESA to use the Hubble Space Telescope to measure the expansion of the Universe. Their results are… mixed. On the one hand, the rate they got for the expansion of the local Universe is consistent with prior art. On the other, the rate they measured for the expansion of the early Universe doesn’t match what other scientists have seen. This points to aof the cosmos.
NASA also sent up a satellite back in November, called GOES-16. It’s just turned in a bumper crop of, which you can check out here:
The next time SpaceX sends a disposable rocket up, which will be a Falcon 9 now scheduled to launch an EchoStar satellite into orbit on 3 February, it should be the last disposable rocket they launch. Future large-payload launches will fly on either the higher-performance. SpaceX also has a launch , headed on a commercial resupply flight to the International Space Station.
Which is a pretty hot property right now, by the way. Some folks from a private space firm want tothat are no longer necessary. NASA hasn’t even agreed yet, and it sure would be a major effort to retrieve and refurb parts. But that’s still probably better than random debris deorbiting over land.
Source : https://www.extremetech.com/extreme/243515-space-rocks-space-telescope-space-station-week-space