rick49
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Post by rick49 on Jul 30, 2023 2:58:20 GMT
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rick49
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Post by rick49 on Aug 10, 2023 1:11:34 GMT
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rick49
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Post by rick49 on Aug 19, 2023 3:00:12 GMT
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rick49
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Post by rick49 on Aug 21, 2023 2:02:23 GMT
Clouds On Neptune Perform a Surprise Disappearing ActMaunakea, Hawaiʻi – "For the first time in nearly three decades of observations, clouds seen on Neptune have all but vanished. Images from 1994 to 2022 of the big blue planet captured from Maunakea on Hawaiʻi Island through the lens of W. M. Keck Observatory, along with views from space via NASA’s Hubble Space Telescope show clouds are nearly gone with the exception of the south pole. The observations, which are published in the journal Icarus, further reveal a connection between Neptune’s disappearing clouds and the solar cycle." www.keckobservatory.org/neptune-clouds/
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rick49
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Post by rick49 on Aug 21, 2023 17:38:27 GMT
russia's Luna-25 crashed. i think they lost contact with it when it was about 2 km from the surface. same height india lost contact with it's Chandrayaan-2 lander in 2019.
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rick49
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Post by rick49 on Aug 23, 2023 17:17:11 GMT
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Post by perrykneeham on Aug 23, 2023 17:21:55 GMT
Yes, kudos to India. Just goes to show what you can achieve if you're not Pakistan.
Stand by for memes of Indian spacecraft contrasted with (only) schoolboys being zip-wired off a homemade cable car in some backward Islamic mountain shithole.
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Post by perrykneeham on Aug 23, 2023 17:28:20 GMT
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rick49
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Post by rick49 on Aug 23, 2023 19:05:42 GMT
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rick49
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Post by rick49 on Aug 23, 2023 19:12:52 GMT
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rick49
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Post by rick49 on Aug 24, 2023 18:19:45 GMT
and india's landing at the Moon's south pole was really impressive because the terrain is so rugged.
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rick49
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Post by rick49 on Aug 24, 2023 18:40:25 GMT
i love this stuff. i remember staying up very late to watch coverage of the first Surveyor soft lander on the Moon.
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rick49
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Post by rick49 on Sept 5, 2023 16:36:08 GMT
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rick49
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Post by rick49 on Sept 6, 2023 14:10:32 GMT
Do we need a new cosmology? Maybe soearthsky.org/space/a-new-cosmology-problems-big-bang-standard-model-webb/"The 6 red dots in these images are 6 galaxies in the early universe, seen by NASA's Webb telescope. Weirdly, they look old. But they're seen at a time when the universe was young. Scientists call them Webb's "impossible early galaxy" observation. As 2 scientists wrote recently: "The finding is akin to parents and their children appearing in a story when the grandparents are still children themselves."
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rick49
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Post by rick49 on Sept 7, 2023 1:07:17 GMT
our resident astronomer (the thing) not going to mock this?
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Post by flatandy on Sept 7, 2023 1:49:23 GMT
A theory is good until a better theory comes along. It's not set in stone, and if observations don't match the theory that means either the observations are flawed (which is possible), or the theory needs tweaking, or the theory needs complete rebuilding. I think of the various observations that led to relativity - and you can argue either way that it was tweaking the theory (we still hold Newtonian mechanics for all except edge-case situation) or a complete rebuilding (relativistic mechanics happen to work like newtonian mechanics in non-extreme cases, but almost all cosmological cases are extreme).
I'm less bothered by Big Bang theory than I am by a lot of other cosmology where they've had to tweak and tweak and tweak to get it to work, that they need 13 dimensional physics where we can't observe 9 of them; and they need 70% of the universe to be made out of a dark matter that nobody has ever seen or found or measured, that they keep adding these unobservable magical constants to make sure that their old science still functions.
The cosmologists might be right - they certainly know more than me, and are clearly way better at complex integrals than me - but I am just not 100% confident that they aren't letting the cart lead the horse.
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rick49
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Post by rick49 on Sept 7, 2023 16:06:36 GMT
Newly found bubble of galaxies, a billion light-years wide"Astronomers in Hawaii have discovered an immense bubble 820 million light-years from Earth. They say it's a fossil-like remnant of the birth of the universe. And they say its size – a billion light-years in diameter – is beyond theoretical expectations." earthsky.org/space/bubble-of-galaxies-hooleilana-baq-hawaii/
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rick49
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Post by rick49 on Sept 7, 2023 16:11:55 GMT
A theory is good until a better theory comes along.
agree.
It's not set in stone,
not so sure about that.
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rick49
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Post by rick49 on Sept 7, 2023 16:16:44 GMT
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rick49
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Post by rick49 on Sept 9, 2023 14:55:57 GMT
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