APOD: Noctilucent Clouds and Aurora Over... (2013 Aug 19)

Comments and questions about the APOD on the main view screen.
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geckzilla
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Re: APOD: Noctilucent Clouds and Aurora Over... (2013 Aug 19

Post by geckzilla » Tue Aug 20, 2013 6:23 am

Borc wrote:
Uwe wrote:Wonderful Pictures, Thanks very much!
(Almost immediately switched off the tacky soundtrack. No need here to go for an Academy Award ^^.
Would have been grateful for some original wind noises, though)
5$ says if you wanted to pay an original composer and orchestra the videographer would be happy to accept your gift. ;)

Beautiful movie.
Someone would still be peeved no matter how sophisticated or expensive the musical undertaking became. There is no solution other than to keep the volume control handy and not let it bother you when it happens. Also, keep in mind that it could have been Happy People Dancing. :lol2:
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Re: APOD: Noctilucent Clouds and Aurora Over... (2013 Aug 19

Post by mjimih » Tue Aug 20, 2013 12:19 pm

The Other Milky Way...
her frustration appears astronomical
I can't resist, it's for his own good...
Click to play embedded YouTube video.
Aliens will find Earth absolutely amazingly beautiful and fragile to behold. But if they get close enough, they'll see 7,000,000,000 of us and think "Uh oh, that's a lot for such a small planet. Wonder if we should help?"

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Re: APOD: Noctilucent Clouds and Aurora Over... (2013 Aug 19

Post by neufer » Tue Aug 20, 2013 5:42 pm

http://www.universetoday.com/104239/the-highest-clouds-on-earth-shine-at-the-top-of-the-orbit/#ixzz2cX2LEEzX wrote: Earth’s Highest Clouds Shine at the “Top of the Orbit”
by Jason Major, Universe Today, August 20, 2013

<<Looking for a new desktop background? This might do nicely: a photo of noctilucent “night-shining” clouds seen above a midnight Sun over Alaska, taken from the ISS as it passed over the Aleutian Islands just after midnight local time on Sunday, August 4. When this photo was taken Space Station was at the “top of the orbit” — 51.6 ºN, the northernmost latitude that it reaches during its travels around the planet.

According to the NASA Earth Observatory site, “some astronauts say these wispy, iridescent clouds are the most beautiful phenomena they see from orbit.” So just what are they? Found about 83 km (51 miles) up, noctilucent clouds (also called polar mesospheric clouds, or PMCs) are the highest cloud formations in Earth’s atmosphere. They form when there is just enough water vapor present to freeze into ice crystals. The icy clouds are illuminated by the Sun when it’s just below the horizon, after darkness has fallen or just before sunrise, giving them their eponymous property. Noctilucent clouds have also been associated with rocket launches, space shuttle re-entries, and meteoroids, due to the added injection of water vapor and upper-atmospheric disturbances associated with each. Also, for some reason this year the clouds appeared a week early.>>
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Re: APOD: Noctilucent Clouds and Aurora Over... (2013 Aug 19

Post by Beyond » Tue Aug 20, 2013 6:27 pm

Image
This image brings to mind a question that has probably been answered somewhere, at sometime, but just how many sunrises and sunsets does the ISS go through in 24 hours??
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Re: APOD: Noctilucent Clouds and Aurora Over... (2013 Aug 19

Post by neufer » Wed Aug 21, 2013 1:54 am

Click to play embedded YouTube video.
Beyond wrote:
This image brings to mind a question that has probably been answered somewhere, at sometime, but just how many sunrises and sunsets does the ISS go through in 24 hours??
The ISS completes 15.50 west to east orbits in 24 hours making for 15.5 sunrises & 15.5 sunsets.
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Re: APOD: Noctilucent Clouds and Aurora Over... (2013 Aug 19

Post by Beyond » Wed Aug 21, 2013 2:27 am

But doesn't the ISS have some orbits that don't have a sunrise & sunset :?: :?:

I've never seen two-wick braided candles before. They look neat :!:
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Re: APOD: Noctilucent Clouds and Aurora Over... (2013 Aug 19

Post by neufer » Wed Aug 21, 2013 1:02 pm

Click to play embedded YouTube video.
Beyond wrote:
But doesn't the ISS have some orbits that don't have a sunrise & sunset :?: :?:
Right :!:

The orbital plane of the ISS precesses about 6º westward with respect to the Sun so that it is bound to be perpendicular towards the Sun sometime during the ~60 day window around the Solstice time periods when it can experience perpetual sun for up to two weeks at a time.
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Re: APOD: Noctilucent Clouds and Aurora Over... (2013 Aug 19

Post by mollygirl » Tue Sep 03, 2013 10:10 pm

I think is real when you watch this video it changes your home page and puts an ask toolbar without your permission

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Re: APOD: Noctilucent Clouds and Aurora Over... (2013 Aug 19

Post by geckzilla » Tue Sep 03, 2013 10:38 pm

mollygirl wrote:I think is real when you watch this video it changes your home page and puts an ask toolbar without your permission
No. You should check your computer for malware. It definitely did not originate from the APOD or the video but some malware could have made it look like it did.
Just call me "geck" because "zilla" is like a last name.

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