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by Watsisname
18 Jul 2018 20:56
Forum: Science and Astronomy Discussions
Topic: Solar System dynamics discussion thread
Replies: 67
Views: 2467

Solar System dynamics discussion thread

I think that could work, at least for a short while. It would be the L1 point which is unstable, and the other issue is that black holes that close together will spiral together very quickly by emitting gravitational waves. I'm not sure how close we can have an equal mass pair in a circular orbit be...
by Watsisname
17 Jul 2018 17:57
Forum: Science and Astronomy Discussions
Topic: Solar System dynamics discussion thread
Replies: 67
Views: 2467

Solar System dynamics discussion thread

Yeah, I don't think it is obvious at all. You'd think it should be possible to orbit as close as the event horizon. Also odd is that light can orbit at exactly 1.5 horizon radii, vs. the 3 radii for massive particles. I've yet to find an intuitive explanation for either of these (besides "the m...
by Watsisname
17 Jul 2018 07:21
Forum: Science and Astronomy Discussions
Topic: Solar System dynamics discussion thread
Replies: 67
Views: 2467

Solar System dynamics discussion thread

JackDole is right. In order for a Lagrange point to exist within the horizon there would need to be a mass in a circular orbit within the horizon. But for a mass, no circular orbits are allowed within 3 times the horizon radius. Black holes are just very strong attractors... stronger than Newtonian ...
by Watsisname
16 Jul 2018 01:59
Forum: Science and Astronomy Discussions
Topic: Solar System dynamics discussion thread
Replies: 67
Views: 2467

Solar System dynamics discussion thread

One other thing to add real quick, and then this will be the last for a while.  I wanted to show that it is also possible to orbit around the unstable Lagrange points (L1 for example), but the orbit is extremely delicate and will fall apart if not carefully maintained. Here it is For Jupiter's L1 po...
by Watsisname
16 Jul 2018 01:17
Forum: Science and Astronomy Discussions
Topic: Solar System dynamics discussion thread
Replies: 67
Views: 2467

Solar System dynamics discussion thread

JackDole , Oof, that's definitely a point of confusion.  In fact, both of those graphics are misleading.  They show the contours of the potential and location of the Lagrange points as if the Sun was only about 10 times the mass of Earth.  (They do this so that the way the Lagrange points are relat...
by Watsisname
15 Jul 2018 19:12
Forum: Science and Astronomy Discussions
Topic: Solar System dynamics discussion thread
Replies: 67
Views: 2467

Solar System dynamics discussion thread

midtskogen, that is an amazing question.  Off hand, my gut feeling is that it cannot, but I do not know for sure!  I will like to investigate this and try to get back to you when I have the opportunity. :)
by Watsisname
15 Jul 2018 18:52
Forum: Off-topic Discussions
Topic: What exoplanet might reply us back?
Replies: 24
Views: 439

What exoplanet might reply us back?

Propulsion Disk wrote:
Qr Bbpost it was announced the curiosity rover found unicellular carbon lifeforms!

If that were true it would be the biggest news of all time.
by Watsisname
15 Jul 2018 01:37
Forum: Science and Astronomy Discussions
Topic: Solar System dynamics discussion thread
Replies: 67
Views: 2467

Solar System dynamics discussion thread

Lagrange Points and Trojan Orbits Gravitational balance and stable configurations in rotating reference frames Introduction: When two masses move in a circular orbit about each other, five  points of gravitational equilibrium are generated, which move along with them.   A particle placed at one of ...
by Watsisname
13 Jul 2018 20:45
Forum: Off-topic Discussions
Topic: What other games do you play?
Replies: 10
Views: 877

What other games do you play?

I still play Descent competitively with people who've been hooked on it since '95.  I also play KSP, Orbiter (if you can call it a game), Minecraft with a few mods like Terrafirmacraft, Terraria (though haven't touched it in a while) and some "Bullet Hell" games like Touhou and its spin of...
by Watsisname
13 Jul 2018 20:38
Forum: Off-topic Discussions
Topic: Show off your work
Replies: 239
Views: 42454

Show off your work

Gorgeous!  And very interesting rock slabs up there.  (Slate?)

We're having the same kind of weather pattern here now -- day after day of crystal clear blue skies and warm temperatures, low wind.  But in a few days I will be driving to Colorado where it is hot and stormy.
by Watsisname
12 Jul 2018 20:23
Forum: Science and Astronomy Discussions
Topic: Science and Astronomy Questions
Replies: 1015
Views: 92893

Science and Astronomy Questions

21541 I was thinking that though the mathematics behind physics are standard throughout the observable universe, it is philosophically possible that our concept of numbers is subjectively species-bound (and perhaps then self-crippling in our viewing of the universe?), and thus might an alien civili...
by Watsisname
12 Jul 2018 17:49
Forum: Off-topic Discussions
Topic: What exoplanet might reply us back?
Replies: 24
Views: 439

What exoplanet might reply us back?

Some of the planets in the Kepler or other exoplanet catalogs could have life on them.  We know there are several that at least are similar to Earth in size, mass, and solar insolation.  Beyond that we simply don't know.  They could be barren, more similar to Mars or Venus.  Once we're able to get g...
by Watsisname
12 Jul 2018 16:23
Forum: Off-topic Discussions
Topic: Unusual weather
Replies: 219
Views: 38292

Unusual weather

Just transferred images from phone and they were quite bad.  But at least it captured it.  To help reduce noise somewhat I blended the last 5 shots taken in quick succession before the battery died: https://i.imgur.com/qF8bwv1.jpg These were taken at 3:50am, while sunrise was at 5:20am.  When I firs...
by Watsisname
12 Jul 2018 04:51
Forum: Off-topic Discussions
Topic: Unusual weather
Replies: 219
Views: 38292

Unusual weather

I just saw a bright display of noctilucent clouds!  My first time seeing them, which was also while kayaking, on a glowing tide of bioluminescence.  Simply magic.

I didn't have the DSLR but did get some shots with the phone right before the battery died.  Hopefully they turn out half-decent. 
by Watsisname
10 Jul 2018 06:26
Forum: Science and Astronomy Discussions
Topic: Solar System dynamics discussion thread
Replies: 67
Views: 2467

Solar System dynamics discussion thread

21471 I think Watsisname has avoided entering there because a proper explanation for what the "generalized" in "generalized potential" is and what lagrange points are merits a longer detailed explanation and this image was just a snipet of what has to be explained. I hope he's t...
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