Just in case you didn't already feel insignificant!

[ishootblanks]

http://www.dailygalaxy.com/my_weblog...s-mo.html#more

just in case living about 100 years as part of a species that has existed a little over 100,000 years on a planet that's maybe 4.5 billion years old in one of thousands of galaxies containing billions of stars in a universe that's slowly drifting apart..

the "big bang" might just be part of a larger cycle!

[Kasierith]

If the universe expanding is a part of the big bang and the residual momentum... but gravity pulls objects back together..... won't eventually the momentum be overcome by gravity sending all galaxies crashing back together?

[kailtas]

Don't worry, i'm the center of the universe.

[jahasafrat]

I read somewhere that our sun's heat output is supposed to increase by 10% over the next billion years which will evaporate the water on earth. And it's only supposed to be about 11 million years until Mars' moon Phobos either breaks up into a planetary ring or crashes into the planet. Exciting times we live in!

[herpecin]

If the universe expanding is a part of the big bang and the residual momentum... but gravity pulls objects back together..... won't eventually the momentum be overcome by gravity sending all galaxies crashing back together?

no. galaxies that are not part of the same cluster are currently moving away from each other at an accelerating rate. eventually even galaxies in the same clusters will spread apart, then local groups, then galaxies themselves, all the way down to where not even sub-atomic particles can be held together and all that there is are photons.

that's referred to as the "big rip" or "big chill" theory. but it wont until something like year 1x10^100000000000000000000000.

the thing spreading stuff apart is dark energy, basically its the energy from the boiling of space-time that happens on the plank length scale. it is a constant force of separation where gravity is an exponentially weakening force the further away you are(2 times as far means ~1/4th the gravity)

[Evil Inside]

I read somewhere that our sun's heat output is supposed to increase by 10% over the next billion years which will evaporate the water on earth. And it's only supposed to be about 11 million years until Mars' moon Phobos either breaks up into a planetary ring or crashes into the planet. Exciting times we live in!

I dunno where I heard this, but apparently our sun only has 6~ billion years of life left, at which point it will expand into a giant and consume all the planets along with it.

[Lefthandpath]

if yer interested in that stuff, but dont want to get yer p.h.d. in that field.....i HIGHLY recommend just watchin carl sagans "cosmos". one of the best series to ever be put on T.V.

i love the "cosmic calendar" part.......if jan 1rst was the big bang, then dec 31rst at 11:59 and 30 some-odd seconds is the recorded history of mankind. we sooooooooooooo dont matter. at all.

[ishootblanks]

I dunno where I heard this, but apparently our sun only has 6~ billion years of life left, at which point it will expand into a giant and consume all the planets along with it.

man.. I hope I'm not alive when that happens!

[Deleted]

Feeling insignificant aint so bad when you think about it.

50 years from now nobody will remember this post on this forum happened
100 years from now il be nothing but ash (because i wish to be cremated after im gone. My body will not be eaten by some goddamn worms)
150 years from now somebody might still remember that i was
1000 years from now nobody will remember i ever existed.

For me that is a comforting thought. Live as best as you can and dont stress and whine over insignificant stuff. In the end it doesnt matter if you made few mistakes or thousand breakthrough's.

[Sam the Wiser]

Well thank god I wont be alive for most of this "bad stuff"

[crawdaddy029]

I dunno where I heard this, but apparently our sun only has 6~ billion years of life left, at which point it will expand into a giant and consume all the planets along with it.

you are right about the giant but probably off on the consume every planet. Apparently the first 4 are gone (including us) but Jupiter should be good and everything behind it (at least until the sun explodes). The idea is at this point life will be able to start forming on Titan (one of Saturn's moons) if it has not already been mined and all the natural resources used up by humans (or other) before that.

Funny I just seen this post on here I was almost immediately before hand reading about Titan and some of the other planets.

[Deleted]

This made me wonder something though... what happens when 2 black holes are next to one another? Does one consume the other? Does it grow? Do both just sit there, just nullifying the effect of the other? Do they orbit around eachother?

As for the black holes existing before Big Bang, not sure, we've been wrong on many things, rather get some definitive proof first.

[Deleted]

This made me wonder something though... what happens when 2 black holes are next to one another? Does one consume the other? Does it grow? Do both just sit there, just nullifying the effect of the other? Do they orbit around eachother?

As for the black holes existing before Big Bang, not sure, we've been wrong on many things, rather get some definitive proof first.

Likely the same things happen like when two stars are next to each other, or two planets etc. Either direct collision or orbiting each other. But if the masses are high enough and the distance small enough, radiation will be relevant. It is predicted by general relativity, two bodies orbiting each other bonded by gravity emit radiation similar to electromagnetic radiation (light). But the effect is far to small for double stats etc and it has never been detected. This radiation will release energy, and could cause orbiting bodies to eventually collide.

In the mean time, you have to watch stars like S2 orbiting the galactic core, perhaps you will find closer still visible objects.

---------- Post added 2012-07-15 at 12:49 PM ----------

no. galaxies that are not part of the same cluster are currently moving away from each other at an accelerating rate. eventually even galaxies in the same clusters will spread apart, then local groups, then galaxies themselves, all the way down to where not even sub-atomic particles can be held together and all that there is are photons.

that's referred to as the "big rip" or "big chill" theory. but it wont until something like year 1x10^100000000000000000000000.

Big rip is more like a thought experiment in modified GR. Accelerating expansion however, the model with a cosmological constant, seems to fit observations best.

[Adam Jensen]

Well if you ever want to feel insignificant, this will blow your mind: http://htwins.net/scale2/

[Tokru]

Well if you ever want to feel insignificant, this will blow your mind: http://htwins.net/scale2/

neat

10chars.

[Pull My Finger]

Don't worry, i'm the center of the universe.

You, sir, cannot be right because I feel deep down inside and am fully certain that I'M the center of the universe.

[Deleted]

If the universe expanding is a part of the big bang and the residual momentum... but gravity pulls objects back together..... won't eventually the momentum be overcome by gravity sending all galaxies crashing back together?

That is one theory.
there is another along the lines of eventually everything will decay into sub atomic particals and keep floating apart from each other.

[Derpules]

Well if you ever want to feel insignificant, this will blow your mind: http://htwins.net/scale2/

Ive seen that before... It never fails to turn my brain into Jello

[OneSent]

If the universe expanding is a part of the big bang and the residual momentum... but gravity pulls objects back together..... won't eventually the momentum be overcome by gravity sending all galaxies crashing back together?

This was actually a Theory proposed by someone on an episode of Through the Wormhole.

I forget the exact details, but essentially he stated that the Big Bang happens more than once, in that the universe expands to a certain degree, and gravity pulls it all back together again, from which the force of all that mass under the effects of gravity causes another explosion, or Big Bang. Kind of like what happens when a star collapses in on itself.

He said that it was like the universe was alive and breathing in the same way that lungs expand and contract or a heart beats. It was really very interesting!

[insmek]

Carl Sagan said it best, I think: