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by Watsisname
12 Sep 2019 09:58
Forum: Off-topic Discussions
Topic: Show off your work
Replies: 385
Views: 75138

Show off your work

31415 Wat, do you use a lightning triggering app for your excellent lightning photos? Nope!  I don't think such an app is necessary.  I just set a long (15") exposure, press shutter, hope for lightning, and repeat. :)   I could have used an intervalometer to trigger the shutter repeatedly for ...
by Watsisname
09 Sep 2019 10:09
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1573
Views: 191409

Science and Astronomy Questions

evildrganymede wrote:
Qr Bbpost pure water is generally colourless too...

Pure water is not colorless.  :)  It is intrinsically slightly blue, which becomes apparent when viewing through a long (few meters) column of it.
by Watsisname
09 Sep 2019 02:59
Forum: Off-topic Discussions
Topic: Unusual weather
Replies: 289
Views: 62545

Unusual weather

As shared in the  show your work thread , last night we had incredible storms pass through western Washington, with cloud tops reaching 35-40 thousand feet (10-12km) and bolts striking down every few seconds for over an hour.  Any lightning is rare here since it is hard to get the atmospheric instab...
by Watsisname
09 Sep 2019 02:09
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1573
Views: 191409

Science and Astronomy Questions

31399 If liquid N2 is totally colorless as it says everywhere, then how would a planet covered on deep oceans of pure liquid nitrogen look like? This is an interesting question.  I have looked around, but cannot seem to find literature on the absorption spectrum of liquid nitrogen over visible wave...
by Watsisname
07 Sep 2019 22:45
Forum: Off-topic Discussions
Topic: Show off your work
Replies: 385
Views: 75138

Show off your work

An intense thunderstorm just rolled through about an hour ago, with many cloud to ground strikes.  Lightning is so uncommon here (maybe you'd hear one or two faint rumbles of thunder in a given summer), so this was a rare treat, and I was thrilled to try my hand at lightning photography again -- som...
by Watsisname
04 Sep 2019 23:50
Forum: Off-topic Discussions
Topic: Show off your work
Replies: 385
Views: 75138

Show off your work

Another nice day in the mountains.  Went high contrast with this shot and love the effect. :)

Image
by Watsisname
27 Aug 2019 19:37
Forum: Science and Astronomy Discussions
Topic: Astrophotography
Replies: 366
Views: 49949

Astrophotography

That is an incredible result,  Phunnie .  I absolutely love that color palette. :) Last night I also did some astrophotography, though not with such nice equipment.  A quiet, beautiful night under the stars in the North Cascades, with the Canon Rebel T3 and a tripod. https://i.imgur.com/XPzlsy4.jpg
by Watsisname
15 Aug 2019 20:11
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1573
Views: 191409

Science and Astronomy Questions

31181 If we had an Earth around a hotter sun in a habitable, say an F, A, or O star, would we get sunburn easier? Yes, we very probably would, for just the same reasons.  The hotter the star, the larger the fraction of its light that comes through UV, so even if we kept the total amount of sunlight...
by Watsisname
15 Aug 2019 19:58
Forum: Science and Astronomy Discussions
Topic: Scientific articles by forum members!
Replies: 3
Views: 259

Scientific articles by forum members!

Fast Fourier Transform's post on mapping the interstellar medium is a definite must. :)
http://forum.spaceengine.org/viewtopic.php?f=10&t=47&start=1545#p31174
by Watsisname
15 Aug 2019 19:33
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1573
Views: 191409

Science and Astronomy Questions

31177 If you had an Earth around a hotter star and it's in the habitable zone, will the star be the same (similar apparent brightness in the sky as the sun or not? Similar, but not exactly the same.  In fact, if the star is either much hotter or colder than our Sun, then from the habitable zone its...
by Watsisname
13 Aug 2019 01:52
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1573
Views: 191409

Science and Astronomy Questions

Slightly aside, if we consider quantum mechanical systems like electrons orbiting protons in atoms, then those orbits are stable against gravitational decay.  In fact they are also stable against electromagnetic decay.  A classical calculation would suggest that because an electron orbiting a nucleu...
by Watsisname
13 Aug 2019 01:24
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1573
Views: 191409

Science and Astronomy Questions

31136 Is there such thing as a stable orbit, or do the laws of physics forbid this? As in, any two body system should lose energy to gravitational radiation right? Yep, you're completely right.  All orbital motion generates gravitational waves, which while for most situations is a really, really  s...
by Watsisname
12 Aug 2019 01:02
Forum: Science and Astronomy Discussions
Topic: Solar System dynamics discussion thread
Replies: 93
Views: 14346

Solar System dynamics discussion thread

31138 40 MJ... that's actually very close to 1/24.96 of a solar mass (that would be 41.96 Jupiter masses exactly)? I'm assuming that's not a coincidence? Good observation!  It is very close and not by coincidence.  It's not quite correct that the rule is "total mass of everything in the orbit ...
by Watsisname
11 Aug 2019 16:31
Forum: Science and Astronomy Discussions
Topic: Solar System dynamics discussion thread
Replies: 93
Views: 14346

Solar System dynamics discussion thread

evildrganymede , good question!  In all my calculations and figures I treat the particle as massless (a good approximation if it is say, a spacecraft or asteroid as a Trojan of a planetary body).   If it is massless, then stability about the L4 and L5 points occurs if the primary mass is at least 2...
by Watsisname
09 Aug 2019 22:00
Forum: Science and Astronomy Discussions
Topic: Cosmology Discussion Thread
Replies: 92
Views: 6966

Cosmology Discussion Thread

31099 Wat, I heard PBS is going to do something about the different predictions for the acceleration of the universe (the differing values of the Hubble constant), did they mean what we had already talked about or is it something new? I think you might be mixing two things.  The Hubble constant is ...