These statements seem absurd from the common point of view, but in fact they are very real and can be easily proven by experiments and by the laws of modern physics. ... The universe is now expanding from this explosion, which is called the big bang. If all the matter in the universe put together had a mass above a certain mass called the critical mass, then the universe would be a closed universe and some day would collapse into the same massive object from which it started out and then would explode again creating a pulsating universe. If the universe had less mass than the critical mass, t...

• Word Count: 3720
• Approx Pages: 15
• Grade Level: High School