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+--- Thread: Discoveries by the telescopes on Mauna Kea (/showthread.php?tid=17412)
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RE: Discoveries by the telescopes on Mauna Kea - HereOnThePrimalEdge - 01-07-2021
Cleaning the mirror on the CFHT observatory (photo):
https://twitter.com/cfhtelescope/status/1347256863956590595?s=21
RE: Discoveries by the telescopes on Mauna Kea - TomK - 01-08-2021
Thanks for that, HOTPE. CO2 cleaning is used on the single mirror optical/IR telescopes, I'm not exactly sure what Keck do on their segmented mirror. Essentially, what you do is spray solid CO2 onto the mirror. The CO2 particles will attach to dust and since the CO2 can't attach to the mirror itself, it drags the dust off as it falls off the mirror. This is why you tilt the telescope over and let the CO2 fall off. If you didn't do that, all the crud would just collect in the middle of the mirror.
It's fun to watch. It's like spraying snow on the mirror and you literally see it slide off with all the MK dust on it.
RE: Discoveries by the telescopes on Mauna Kea - TomK - 01-08-2021
How Subaru does it:
https://youtu.be/4R34fQY3uCE
RE: Discoveries by the telescopes on Mauna Kea - HereOnThePrimalEdge - 01-08-2021
Thanks TomK,
The Subaru YouTube link demonstrates the cleaning process much better than a photo. It's quite a procedure, thanks!
RE: Discoveries by the telescopes on Mauna Kea - HereOnThePrimalEdge - 02-12-2021
The closeup of Mauna Kea shows details such as the circular outline of the white observatories almost hidden in snow and the plowed road on the summit:
A new satellite image has captured the stunning white peaks of two volcanoes on the Big Island in Hawaii, which have experienced their second-most extensive snow coverage since current records began.
The high-resolution image — snapped on Feb. 6 by the Operational Land Imager (OLI) onboard the Landsat-8 satellite — shows the striking contrast between the snow-covered peaks of Mauna Kea and Mauna Loa and the surrounding volcanic rock.
https://www.livescience.com/hawaii-snow-stellite-images.html
RE: Discoveries by the telescopes on Mauna Kea - eightfingers2.0 - 02-13-2021
“ second-most extensive snow coverage since current records began. ”
Global warming! Global cooling! Climate change!
RE: Discoveries by the telescopes on Mauna Kea - kalianna - 02-13-2021
(02-13-2021, 07:58 AM)eightfingers2.0 Wrote: “ second-most extensive snow coverage since current records began. ”
Global warming! Global cooling! Climate change!
Are you saying that because Mauna Kea had a bunch of snow, climate change isn't real?
RE: Discoveries by the telescopes on Mauna Kea - terracore - 02-13-2021
I think what they are saying is that people are tired of the manufactured crises. Every decade it's something new. In the 70's they say we'd be under ice sheets by now. Then in the 80's we'd be under water. In the 90's we were supposed to run out of oil. Global warming never panned out so they changed it to "climate change". Of course the climate is changing. The climate has never stopped changing. Last year they wheeled out an autistic teenager to lecture the planet. Last week she had to delete her tweet that contained information about a climate conspiracy to undermine democracy in India.
If people present only political answers and new taxes to "solve" climate problems, then you might want to keep an open mind about the science, if for no reason, the utter failure of every climate crisis to come to fruition. Recently the President stopped production of a pipeline that would deliver oil without causing further pollution. So it will continue to travel on Warren Buffet's diesel-burning railroads instead. Politics, not climate solutions.
RE: Discoveries by the telescopes on Mauna Kea - leilanidude - 02-13-2021
Are you saying that because Mauna Kea had a bunch of snow, climate change isn't real?
------------
There is a reason why it is was called Mauna Kea by the ancient Hawaiians. White mountain.
RE: Discoveries by the telescopes on Mauna Kea - kalakoa - 02-13-2021
Extracting oil from tar sands creates more pollution than any other production method. The extra impact from rail transportation is a rounding error.
Until humans stop burning things to make energy, the rate of climate change will continue to accelerate. Evolve or perish.