If space is expanding faster than the speed of light, does that mean an object can escape a black hole's event horizon eventually?
>>7912460
>If space is expanding faster than the speed of light
It isn't, it's expanding at 70km/s/mpc
>>7912487
/thread
>>7912487
>>7912595
>>7912487
no...
the speed itself increases 70km/s/mpc
>>7912709
That is literally what the rate of expansion is you fucking idiot.
read the OP before you comment
Will the universe ever stop expanding? What happens after that?
>>7912780
something at one mpc away from us is moving away at 70km/s, something 2 mpc away is moving at 140km/s etc.
if space is finite, its diameter is most certainly not increasing at 70km/s
Space is expanding.... That seems fast... The bit of space i have right here... (i got a 1cm x 1cm x 1cm cube of it under a glass) doesnt seem to be expanding at all.
>>7912803
>something at one mpc away from us is moving away at 70km/s, something 2 mpc away is moving at 140km/s etc.
NO.
These things are NOT moving (any more than their mundane, ordinary velocities).
The space between us is expanding, there's a difference.
>>7912487
>it's expanding at 70km/s/mpc
Google says
>the expansion of the universe has been measured using redshift to derive Hubble's Constant: H0 = 67.15 ± 1.2 (km/s)/Mpc.
>>7912805
>(i got a 1cm x 1cm x 1cm cube of it under a glass) doesnt seem to be expanding at all.
Even at only 67km/Mpc, it's expanding at about 0.000000000216% per second, or 0.0000000129% per minute, or 0.000000778% per hour, or 0.0000187% per day, or 0.00682% per year.
It should take 146 years to expand 1%.
...hmmm, that does seem kind of fast.
Anybody check my math?
>>7912840
>It should take 146 years to expand 1%.
>...hmmm, that does seem kind of fast.
>Anybody check my math?
It seems you're off by 8 orders of magnitude:
http://www.wolframalpha.com/input/?i=1.01%2F%2867+km+%2F+s+%2F+million+parsecs%29
Actually 14.7 billion years. So yeah, 146 would be fast...
>>7912796
The two theories which I'm aware of
>Infinite expansion
>big crunch
Might be a 3rd but I don't know it
The outcome depends on if Omega is less than one or greater than one.
If Omega >1 the universe is closed thus resulting in a big crunch.
If Omega <1 the universe is open thus resulting in infinite expansion
Where Omega is equal to the density of the Universe divided by the critical density (3H^2)/(8piG). I'm not aware of the current calculations for these values though
>>7912840
oh dear, off by 2.85km. better kill myself
>>7912840
>Using %
>>7912805
Space as in the entirety of the universe, not the objects in the universe. You are not expanding.
>>7912840
>not reading hawkings papers and realizing that a cosmological constant less than 1 can also cause expansion
>>7912460
>space is expanding
Pop sci misconception. Nothing is expanding.
>>7912901
>You are not expanding
But the popsci redditors here are
