At day1 of the Big Bang, what was the borbability to have a planet earth? ?

Question

what was the probability to ve 2 earths, 3, 4...?

thx

Answer 1

0%. Things were too chaotic (and hot)!

Answer 2

just after the event, there was expansion at a rate scientists presume to be faster than light.  Nowadays, the way I figure it, space is just too massive and far-flung NOT to have some planet out the somewhere with similar earth-like conditions.  

In fact, look up Gliese 581c.  It's not a perfect match but it has liquid water.

The issue arises when we think of traveling between them.  Our speed limit is theoretically the speed of light.  Even at that rate, to get out of our galactic "neighborhood" we would have to travel for many years.

Answer 3

None. After the Big Bang everything was chaotic, extremely hot and much denser then the universe is today. It was more like a big soup of particles. It took a long time before the first stars formed (millions to billions of years). Those stars had a different composition from the stars which we see today and I doubt they had Earth-like planets orbiting them. It also takes time for a planet to form.  

Answer 4

Zero.

Answer 5

It took over 300,000 years for the "big bang" to cool down enough for the plasma to form normal gas.  I'm not sure what you mean by "day1" "probability" [I assume that is the word you meant].   Since our Earth exists, the probability was / is 100%.  There is only 1 Earth in the whole universe, so the probability of two Earths is zero.

It is more interesting to figure how many near-Earth planets there might be.  If you define near-Earth as 98% of Earth gravity, with atmosphere that is 98% the same as Earth had sometime in the last billion years, then I  would guess that there are 1 or 2 near-Earths in most galaxies.   There are about 100 billion galaxies in the universe.

Answer 6

The probability was one, because we're here!

The number of earths in the universe suitable for sentients like us, according to the latest Rare Earth theory constraints, is one every 25 million cubic light years.  So there's plenty of them out there, but only us in the Milky Way or Andromeda Galaxy.  There's 5 or 10 more in our Local Supercluster, as the density of galaxies goes up in its conglomeration.   By these estimates, there's at least a few million favorable sites for sentients beyond that, beyond 100 million light years from us.