Question: How is it possible to make a planet or star? Also is it possible to create oxygen?

Sam Geen answered on 21 Jun 2013:

Planets and stars form when a gas cloud collapses into a disk shape. Spiral shapes in the disk begin as the disk is often a bit unstable, and gravity makes them clump together. The middle of the disk becomes the star. Eventually the gas collapses into planets and asteroids, which collide together when the new solar system is young and eventually the planets clear out their orbits of debris.

You can make oxygen! It’s normally made by old stars, which have finished burning hydrogen and turning it into helium. They start to make carbon, nitrogen and oxygen this way. But it’s hard to make it on Earth, although you can release oxygen atoms from molecules (like water) into oxygen gas, which is two oxygen atoms bonded together.