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Post by MartinT on Feb 3, 2021 19:54:22 GMT
Einstein will not roll over so easily!
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Post by jandl100 on Feb 9, 2021 10:39:03 GMT
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Post by MartinT on Feb 9, 2021 11:23:01 GMT
Wow - especially the Indian subcontinent.
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Post by jandl100 on Feb 15, 2021 14:44:28 GMT
Can a moon have a moon of its own? Yes, but the constraints are quite onerous. None have yet been seen in our own solar system. It has to be inside the Hill radius - which I hadn't heard of before - the distance beyond which the body being orbited no longer dominates gravitationally. Interestingly, our own Moon could have a moon of its own but doesn't seem to have one. astrobites.org/2021/02/15/a-moons-moon/
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Post by MartinT on Feb 15, 2021 19:33:52 GMT
That's interesting and I never gave it any thought before. Our Moon is unusually large for its planet. I wonder how that works? Of course, it's had a few man-made moons in the past.
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Post by jandl100 on Feb 19, 2021 7:45:23 GMT
New research shows that the most recent reversal of the Earth's magnetic field, 42000 years ago, was a catastrophic event for life on Earth causing major global weather pattern changes and mass extinctions. "Earth's magnetic field dropped to only 0-6 percent strength during the Adams Event," says Prof. Turney. "We essentially had no magnetic field at all—our cosmic radiation shield was totally gone." Early humans around the world would have seen amazing auroras, shimmering veils and sheets across the sky," says Prof. Cooper. " Ionised air—which is a great conductor for electricity—would have also increased the frequency of electrical storms. "It must have seemed like the end of days," says Prof. Cooper. There are indications that the magnetic field is starting to flip again. phys.org/news/2021-02-ancient-relic-earth-history-years.html?utm_source=nwletter&utm_medium=email&utm_campaign=daily-nwletter
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Post by MartinT on Feb 19, 2021 8:35:35 GMT
Only 42,000 years ago?
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Post by jandl100 on Feb 19, 2021 8:51:42 GMT
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Post by jandl100 on Feb 19, 2021 10:28:24 GMT
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Post by Slinger on Feb 22, 2021 15:13:42 GMT
From a post in my Farcebook feed.
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Post by jandl100 on Feb 24, 2021 10:20:00 GMT
The article linked below highlights the difference in approach between NASA and SpaceX. www.sciencealert.com/spacex-is-about-to-attempt-another-starship-launch-the-last-two-exploded"SpaceX Is About to Attempt Another Starship Launch. The Last Two Exploded" SpaceX go in for destructive beta testing, happy for it to go up in smoke and try again, whereas the NASA philosophy is to take it steady and slow and expensive, and get it right first time. The very recent Perseverance landing on Mars is a perfect example of the NASA philosophy in action. The usual SpaceX approach wouldn't have worked for that.
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Post by petea on Feb 24, 2021 13:16:10 GMT
And Mars would have had a few more craters!
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Post by Slinger on Feb 24, 2021 14:12:50 GMT
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Post by MartinT on Feb 24, 2021 14:54:52 GMT
Wonderful motto.
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Post by jandl100 on Mar 3, 2021 6:08:49 GMT
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Post by jandl100 on Mar 3, 2021 6:38:33 GMT
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Post by jandl100 on Mar 3, 2021 9:46:05 GMT
"February marked significant progress for NASA's James Webb Space Telescope, which completed its final functional performance tests at Northrop Grumman in Redondo Beach, California. Testing teams successfully completed two important milestones that confirmed the observatory's internal electronics are all functioning as intended, and that the spacecraft and its four scientific instruments can send and receive data properly through the same network they will use in space. These milestones move Webb closer to being ready to launch in October. phys.org/news/2021-03-nasa-james-webb-space-telescope.html?utm_source=nwletter&utm_medium=email&utm_campaign=daily-nwletter
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Post by MartinT on Mar 3, 2021 10:53:54 GMT
Did they check the mirror...?
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Post by jandl100 on Mar 3, 2021 10:58:55 GMT
Oops, dang it, I knew they'd forgotten something.
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Post by jandl100 on Mar 4, 2021 11:20:48 GMT
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