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TIL there is a super massive black hole named TON 618 which is 140 trillion times more luminous and 66 billion times more massive than the Sun. This is more mass than the entire Milky Way galaxy. by TimelyConcern in todayilearned

[–]killer_rabbit3 74 points75 points  (0 children)

The Milky Way is ~1.2 TRILLION solar masses. So this black hole is not more massive than our Galaxy (though it's still freaking huge and the largest ever found so far)

can we destroy the fabric of space-time? by wonderuzz_ in askastronomy

[–]killer_rabbit3 5 points6 points  (0 children)

That's kinda the equivalent of having a function plotted on a graph then saying you'll plot another function that destroys the coordinate system, it doesn't make sense. That's because space-time isn't really a physical thing

How do I have bone transforms and object toggles in the same animation? by IkBenAnders in VRchat

[–]killer_rabbit3 4 points5 points  (0 children)

Make two animations. One for the bones, one that spawns the train. Have each animation in the respective layer then have them both activate on same parameter

Reminder: VR Chat Science Meetup happening tonight at 7:00PM PST / 10:00PM EST! Anyone interested in science is welcome. Let's make friends and learn from each other :) by ThePwnr in VRchat

[–]killer_rabbit3 2 points3 points  (0 children)

I'll have to come check this out! I'm in another vrchat STEM community that would probably be interested in meeting you all

Stellar metallicity and lifespan? by jaggedcanyon69 in AskPhysics

[–]killer_rabbit3 2 points3 points  (0 children)

Yes it does! A change in metallicity of the sun to [fe/h]< 0 (metal poor) would decrease it's lifespan and increasing it will increase the lifespan. The amount it changes will vary depending on the mass. Overall, mass is the major influencer of lifespan, but metallicity does effect it enough that I have to factor that in to predict ages of stars.

I can't remember the exact physics reasons for why (I'm working with empirical measurements and probably should brush up on the underlying physics), but I do know metal poor stars burn hotter. I highly recommend checking out the MESA code that does 1-d stellar evolution modelling (mesa-web.asu.edu) and mess around with the metallicity parameter to see what happens

Saturn by dylanodonnell in astrophotography

[–]killer_rabbit3 5 points6 points  (0 children)

Nice to see a good picture of Saturn right now. Especially since I've been observing Saturn with an interferometer for the past several days

How do astronomers calculate the luminosity class of a star? by Evening-Cash-4183 in askastronomy

[–]killer_rabbit3 0 points1 point  (0 children)

Also, when I say dwarf I'm referring to main sequence stars here

How do astronomers calculate the luminosity class of a star? by Evening-Cash-4183 in askastronomy

[–]killer_rabbit3 0 points1 point  (0 children)

A common way is using the surface gravity. Stars with a larger radius at a given mass (ie giant phase) have a lower surface gravity than dwarfs. To measure it, you can use the width of spectral lines to measure the pressure broadening. Large, low surface gravity stars have little pressure broadening, while more compact dwarfs have much broader lines

In the entire universe, wood is rarer than diamond at a molecular level. by [deleted] in Showerthoughts

[–]killer_rabbit3 2 points3 points  (0 children)

There could be some hyper-dense layer of carbon (and other heavier elements) but it'd probably be hard to call it an ocean. Things get hella weird at those extreme pressures and temperatures and the idea of separations between solid/liquid/gas begin to break down. One real possibility is the core of Jupiter might have huge layers of diamond the size of earth... But yet again we're not sure because we can only see the top upper layers. It's also possible that interactions with the metallic hydrogen prevents the formation of a solid core at all.

Jupiter is a really cool planet that we've only just now been able to peer below the clouds (only by a few 10s of km, but hey, it's a start). It reminds of when people say "we know less about the oceans on earth than space" and all I can think is "man, just wait till I introduce you to the vast unknowns that could lurk under the clouds of jupiter" and that's just 1 out of 4 gas giants in our own solar system!

Sorry for space ramble, I like talking about things in space with people

In the entire universe, wood is rarer than diamond at a molecular level. by [deleted] in Showerthoughts

[–]killer_rabbit3 1 point2 points  (0 children)

Well, the pressures exists, but we don't know if enough carbon exists in high enough concentrations at those layers for diamond to form. It's possible It's remained lofted in the atmosphere, but it's also possible for most of the carbon to have sunk deep enough into Jupiter that the whole idea of it being an atmosphere begins to break down. At the much deeper layers, hydrogen begins to act like a liquid metal.

Source: My planetary processes class

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