The Great Alien Debate

[Liam]

ummm, Black holes dont theoreticaly move? everything moves around them because of their immense gravitational force. Aliens told us that

It was just an example Il switch it to "Giant meteor"

[Arthur Maiden]

ever seen that film where they nuke it?

[MAKG]

ummm, Black holes dont theoreticaly move? everything moves around them because of their immense gravitational force. Aliens told us that

I'm not sure what you're responding to, but at a large distance, a black hole behaves EXACTLY like a normal object of the same mass, charge, and angular momentum. It's only when you get really close that anything unexpected happens. How close is close? For a solar-mass black hole, the event horizon is about 3 km. So, close means comparable to the diameter of a small city. If you replaced the sun with a solar mass black hole, aside from getting really cold, the Earth's orbit (including tides, etc.) wouldn't change at all. No one gets ripped apart. The earth doesn't fall in (at least not much faster than it would fall into the sun -- which it will eventually do as tides eat up orbital energy).

The event horizon radius for an uncharged black hole is directly proportional to its mass. So, if you get the Sag A candidate (around a million solar masses) the radius is about 3 million km. Sounds like a lot, but Earth's orbit is about 50 times larger. Still VERY close to see an effect. For the largest black hole observed, that's 3 billion km, or about 20 AU. That gets you to Uranus. Still utterly tiny compared to intersteller distances (Proxima Centauri is about 270,000 AU away, and that's the closest star).

Movies of course often magnify the effect, much like they use faster-than-light travel, since reality would make a boring movie.

[Arthur Maiden]

Thats not possible either, and the gravity of a bloack home means it becomes like the sun anyway, ofcourse, 3 million solar masses wouldnt be enough, it has to be at least 5.2million or else it just becomes another dying star... that is because of the chandrakar limit, if it aint over, it aint a black hole(possibly)

[MAKG]

Thats not possible either, and the gravity of a bloack home means it becomes like the sun anyway, ofcourse, 3 million solar masses wouldnt be enough, it has to be at least 5.2million or else it just becomes another dying star... that is because of the chandrakar limit, if it aint over, it aint a black hole(possibly)

'Fraid I'm not following you. The Chandra limit is 1.4 solar masses. But that's not the only way to make black holes; some (currently disfavored) early universe models make them in the Big Bang. The supermassive ones may come from stellar collisions (or in some models, they precede their host galaxies). The Chandra limit relates electron degeneracy pressure to gravitational energy. Get your energy elsewhere and it doesn't apply. Our sun will not become a black hole at the end of its life, but that doesn't mean there aren't others there.

[Mobius1]

And we shall never forget that it is the aliens who steal the light from the bulps in the evening and put it in the fridge.
Did you never ask yourself where all the light is going to if you turn off the light switch? Well, look into the fridge. It is the aliens who do this.

I laughed so hard at this. I do that when I'm sleepy, but it is funny.

(until, of course, the second coming of J.H.Christ )

and what was that a reference to?

[MAKG]

And we shall never forget that it is the aliens who steal the light from the bulps in the evening and put it in the fridge.
Did you never ask yourself where all the light is going to if you turn off the light switch? Well, look into the fridge. It is the aliens who do this.

I laughed so hard at this. I do that when I'm sleepy, but it is funny.

What about single socks in the dryer? No, wait. That's the dark matter.

[Arthur Maiden]

also, that why car keys end up in the fridge aswell