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by Watsisname
05 Sep 2020 04:41
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1713
Views: 285991

Science and Astronomy Questions

34398 Can one make it into (let's say) at the same altitude as our cirrus clouds and not get burned up or hit the planet? Maybe, if it is large (100s of meters across or more) and dense enough, but even then it might not survive the journey for other reasons (the ram pressure may fragment it or eve...
by Watsisname
04 Sep 2020 17:36
Forum: Off-topic Discussions
Topic: Unusual weather
Replies: 378
Views: 89372

Unusual weather

A layer of smoke blew in from the wildfires in California today, upon which the clouds cast very dramatic shadows:

Image
by Watsisname
01 Sep 2020 20:14
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy News
Replies: 776
Views: 137442

Science and Astronomy News

34375 An asteroid will approach the planet at a distance of about 120 thousand kilometers. Just for comparison, the distance from the Moon to the Earth is 384,4 thousand kilometers.   In those terms, that actually doesn't sound very close at all. The Moon is farther away than most people realize, e...
by Watsisname
29 Aug 2020 17:49
Forum: Mods and Addons
Topic: Mods and Addons - Requests, suggestions and ideas
Replies: 393
Views: 106852

Mods and Addons - Requests, suggestions and ideas

claudeir2323 , this is an English speaking forum. If you can, please write your posts in English or use an online translator. Please also don't replicate your posts in other threads. This did not belong in the science and astronomy questions thread. For your suggestion, the Space Engine universe is...
by Watsisname
26 Aug 2020 00:45
Forum: Off-topic Discussions
Topic: Coronavirus (COVID-19) Thread
Replies: 180
Views: 19825

Coronavirus (COVID-19) Thread

34354 Apparently there has been at least three confirmed cases of people who have had COVID-19 and recovered, have now come down with it again. Perhaps a mutated strain already, but certainly not a good sign. Yes, there had been quite a few unconfirmed reports of reinfection, and now it seems well ...
by Watsisname
25 Aug 2020 17:49
Forum: Science and Astronomy Discussions
Topic: Astrophotography
Replies: 481
Views: 84132

Astrophotography

pzampella, that is amazing! What even is there to critique? :) Everything looks crisp and the colors and nebulosity came out beautifully. And it looks very natural, not over-processed at all. Love it!
by Watsisname
25 Aug 2020 04:37
Forum: Off-topic Discussions
Topic: Coronavirus (COVID-19) Thread
Replies: 180
Views: 19825

Coronavirus (COVID-19) Thread

207,000 Missing Deaths: Tracking the True Toll of the Coronavirus Outbreak With around 812,000 official deaths worldwide due to COVID-19, plus an additional 207,000 deaths above normal according to this analysis by the New York Times, it appears likely that the true number of deaths has now passed ...
by Watsisname
24 Aug 2020 16:46
Forum: Science and Astronomy Discussions
Topic: Astrophotography
Replies: 481
Views: 84132

Astrophotography

Moved some recent Q&A about meteors and their colors, altitudes, and possible sounds associated with them to the Science and Astronomy Q&A thread. There's actually quite a few interesting tangents and the conversation may be continued there. :)
by Watsisname
24 Aug 2020 14:20
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1713
Views: 285991

Astrophotography

34339 Thanks, Wat! It sounds like these forbidden reactions last so long because, for them to happen, requires a lot of energy! It is not really a function of energy. Think about it: if a particular forbidden transition produces a photon of visible light, that's basically the same energy as any all...
by Watsisname
20 Aug 2020 22:02
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1713
Views: 285991

Astrophotography

34327 Why is it called the "forbidden transition" Wat?    It doesn't seem to be all that forbidden Yes, it's a bit of misnomer, although it  almost  means what it implies.  "Forbidden" transitions  are not impossible, but they are profoundly less probable than "allowed"...
by Watsisname
18 Aug 2020 22:03
Forum: Off-topic Discussions
Topic: Show off your work
Replies: 432
Views: 107386

Show off your work

A hike through clouds and wildflowers. https://i.imgur.com/E07mccZ.jpg https://i.imgur.com/LtmusXU.jpg https://i.imgur.com/0jhPPzz.jpg https://i.imgur.com/Mhi6Wj1.jpg https://i.imgur.com/3ZhTm7D.jpg https://i.imgur.com/XRUuzEa.jpg https://i.imgur.com/qo9oRVh.jpg https://i.imgur.com/2Y1yD7T.jpg https...
by Watsisname
18 Aug 2020 03:31
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1713
Views: 285991

Science and Astronomy Questions

Nice!  I think you got it.
by Watsisname
18 Aug 2020 00:40
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1713
Views: 285991

Science and Astronomy Questions

34319 How do you calculate it should be 206.5 orbits? For  δϕ=104.6 arcminutes = 1.743 degrees, that's 360/1.743 = 206.5 orbits for the apsides to precess by 360 degrees. Added: such a precession rate is astonishing. For comparison, the general relativistic perihelion precession of Mercury'...
by Watsisname
17 Aug 2020 23:43
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1713
Views: 285991

Science and Astronomy Questions

JackDole , okay, looking at your animation for the star S4714, it looks like it completes 360 degrees of apsidal precession in about 33 orbits, whereas according to the table it should be 206.5 orbits. So it's too fast by a factor that looks exactly like 2pi, which makes me think that the meaning o...
by Watsisname
17 Aug 2020 11:27
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1713
Views: 285991

Astrophotography

34307 On DPR someone named "Jack" captured a picture of the kind of color I saw, so maybe these multicolored meteors aren't so rare?  No, not rare at all. The color change shown in his image looks exactly like the color change captured in one of my shots of another Perseid .  The green at...