Stars like the Sun are powered by nuclear fusion of hydrogen into helium.  When they start to run out of hydrogen, they collapse inward until enough pressure is created for the helium core to support itself.  The increased pressure causes the hydrogen fusion to happen more rapidly, and the increased energy throws the outer layers of hydrogen outward, creating a red giant.

Eventually, the star will begin to exhaust its remaining supply of hydrogen, and the energy drop will cause it to collapse further.  When enough pressure is created, the helium will begin nuclear fusion, creating beryllium.  The beryllium isotope created by helium fusion has an extremely short half-life, but if there is enough energy and pressure, a third helium will fuse with the beryllium to create carbon. 

a ton of stones weighs the exact amount as a ton of feathers. its true!!! :P

 Oh yeah, there will still be a lot of space between them, but with all the gravitational field of each stars, you never know what's going to happen. Chao theory is the best idea we have to explain all the motion of the planets. I've seen computer animation of what is likely to happen, and it's pretty crazy stuff to say the least.

 psst, I up your ban to 100 million years. ;)

Fact: there are no worms in wormholes

Deal!

Here's something from way back about 5 years ago:

There is a point around a black hole in which the force of gravity is so great that even light will orbit it within a certain distance. Theoretically, on that exact line, if one were capable of observing without being sucked into the black hole, they would see the orbit as being that of a straight line. Inside of that line, the light would actually appear to curve AWAY from the black hole.

It has been found that inside of this zone, the centripetal effect is actually the reverse of what it should be during an orbit.

I myself have theorized that this implies that much how light determines the distortion of time, but that every other physical vector within this universe is is distorted based on light. While you can go backwards, you cannot have a negative velocity, it is merely a velocity in a different direction.

Of course, that was 5 years, and may have already been explained some other way or completely disproven, but I still found it extremely interesting at the time.

FACT: The Universe will eventually freeze to death then eventually implode thanks to dark energy and dark matter.

fact: Pluto is a rock.......... and an imaginary dog.

Fact: Cosmologists make a living by coming up with  some "out of this world" bull.