Im an athest, and I belive the evolution theory, but I dont understand the big bang theory.?

Question

The famous theory,

from nothing came something....

It said that the space blew up and small bits of stuff molded together were made into planets, stars etc...

Now, how come the planets are a perfect sphere. If lets say earth is made up of layers of space garbage from the big bang theory then wouldnt it be an irregular shape planet.

Is space gravity in play that makes planets and stuff into a perfect sphere.

Answer 1

If you could "understand" the Big Bang, you'd be the greatest physicist the world has yet known.

From a singularity came something may be a better description as all the matter in the cosmos was compressed into something that was infinitely small (i.e. it didn't exist).

The reason that planets and stars are spherical is because of gravity. After the big bang matter coalesced into bodies which were massive enough for the particles to create "balls". Those with insufficient mass (clouds, asteroids, etc) for gravity to do the business stayed as irregular shapes.

Answer 2

You need to read up on the big bang theory. First thing is: it didn´t happen in space. There was no space so there was no "what was it expanding into?". There was no time so there was no "before the big bang". There wasn´t even matter so there is no "what exploded?" or "out of nothing came something". Out of the big bang came everything.... And there were no laws of nature which now governs all matter and energy. This is all very confusing to you, and the rest of us, because we live on a planet made out of atoms residing in space with three spatial dimensions and one temperal. So it is hard for anyone to imagine a place as bizarr and exotic as the universe 1 second after the big bang when all matter in the universe formed. And not even science can guess at what exactly was going on til 10^-43 after the big bang because no model can go back further.

And now for something completely different.
Consider earths surface. There is Mount Everest at almost 9 km of height. There is the Challenger deep at over 11 km. The surface of earth has irregularites in height of 20 km! Hardly a perfect sphere. If earth was completely round earth would be covered with a global ocean 2 km deep.
The sphere is the geometric figure that uses the least energy. Gravity always pulls at matter and if there is an object with mass it will pull objects with less mass towards its center. If the big object has irregularites the smaller will move until it has come as close to the center as possible. And so will the next little object. And the next until you have a sphere where all things on the surface are as close to the center as they can mathematically left. If the objects are all solid, which they would be if the formation occured when the matter was cold, then the objects could snag into each and keep from forming a sphere. We see this in the asteroid belt where manu of the occupants are more potatoe shaped than anything else. Earth and the other planets formed out of so many object impacting each other they become so hot they melted. And the particles in a liquid form spheres much more easy than in solids.

Answer 3

The universe is observed to be expanding. Evidence is the redshift of light from distant galaxies. And the more distant a galaxy, the greater its redshift and therefore the greater the speed with which it is moving away from Earth. This is exactly the kind of motion you would expect if the whole universe had started small and blown up, hence the name "big bang". But everything else is pretty much speculation. In particular, the actual origin is not discussed at all, only the resulting evolution after the expansion started. And there are a few people who do not believe the red shift truly indicates motion away from the observer. They assume it must be due to some other effect, like photons losing energy over billions of years or some other as yet unknown effect. This is definitely a fringe opinion, but not without merit.

Answer 4

First, the Bog Bang and planet formation are two separate things.

Why the planets are spheres is simply a result of gravity. Once an object gets beyond a certain mass the strength of the material it is made from is no longer sufficient to overcome the force of gravity acting on it as a result of its own mass, and so gravity pulls it into a sphere so every point on its surface has the same gravitational potential. The solid crusts of planets like Earth are still strong enough to support mountains, but these are tiny compared to the size of the planet.

Answer 5

I can see why you don't understand it - you might want to read up on it a bit to fill in the gaps. It didn't come from nothing, it probably emerged from the collapse of a previous universe. It wasn't an explosion, it was an expansion. It took billions of years to get planets and stars out of it, they didn't just form immeadiatly.

Planets are spherical in shape because of gravity. If something is massive enough, gravity pulls it into a spherical shape.

Answer 6

"Now, how come the planets are a perfect sphere."

Gravity + vacuum = sphere

That is the simple part, we understand everything is spherical because of gravity.

The problem is still how does something come from nothing.

Answer 7

Hey, As far as we all know a theory is like the word " I guess" so there's nothing there to be proven. Every living thing in this planet is well organized because there is a supreme being that makes it work perfect. Only because of the our intellectual miscalculation we only hope that there is someting that comes from nothing. Don't try to understand a greater knowledge. Always remember that your understanding is only limited like a 160gb hard disk trying to download all the files in the internet that sounds like trying to put the whole ocean in the hole that you dig beside the sea. The more you discover things the more question you will ask. That is the truth about life. So humble yourself and people will be proud of you.