NPR: A meteorite crashes through a home in Canada, barely missing a woman’s head. “It turns out that the 2.8-pound space rock, about the size of a small cabbage, was part of a meteor shower identified by Alan Hildebrand, a planetary scientist in the Department of Geoscience at the University of Calgary, and his colleagues. The group said the trajectory of the meteorite that hit Hamilton’s house would have made it visible throughout southeastern British Columbia and central and southern Alberta.”
Victoria News: B.C. woman awakes to a hole in her roof and a space rock on her pillow.
Second link via MetaFilter.
… sind weder schwarz noch Löcher.
Anlässlich der “Black Hole Week” von NASA veröffentlichte Markus Pössel im April auf seinem Blog eine Reihe zu schwarzen Löchern:
Relativ einfach: Woche der Schwarzen Löcher. 1: Sicherheitshinweise, 2: Akkretion, 3: Schattenrisse mit dem Event Horizon Telescope, 4: Wellenschlag mit LIGO, Virgo & Co., 5: Singularitäten als Wissenslücke.
100SekundenPhysik: Wie schwarze Löcher wirklich aussehen. (YouTube, 4min)
NPR Obituaries: Remembering Allan McDonald: He Refused To Approve Challenger Launch, Exposed Cover-Up.
“On Jan. 27, 1986, Allan McDonald stood on the cusp of history.
McDonald directed the booster rocket project at NASA contractor Morton Thiokol. He was responsible for the two massive rockets, filled with explosive fuel, that lifted space shuttles skyward. He was at the Kennedy Space Center in Florida for the launch of the Challenger “to approve or disapprove a launch if something came up,” he told me in 2016, 30 years after Challenger exploded.
His job was to sign and submit an official form. Sign the form, he believed, and he’d risk the lives of the seven astronauts set to board the spacecraft the next morning. Refuse to sign, and he’d risk his job, his career and the good life he’d built for his wife and four children.
“And I made the smartest decision I ever made in my lifetime,” McDonald told me. “I refused to sign it. I just thought we were taking risks we shouldn’t be taking.””
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Smarter Every Day: How NASA Trained Lunar Lander Pilots. (YouTube, 23min)
“We’re going back to the moon, and we’re going to need to train Astronauts how to land. This video is the result of trying to understand that control problem better. In the next video of this series, I’ll show you footage from an actual NASA Lunar Lander software test I participated in many years ago.”
The video includes an interview with C. Wayne Ottinger, NASA Apollo LLRV Project Engineer.
I posted about this music video twice before, but the links have since broken. Here’s an update:
OK Go: Upside Down & Inside Out music video (YouTube, 3:21min)
Background material, all YouTube links:
Source: OK GO Videos and OK GO YouTube Channel.