Dear Professor Kaku; I know that I am not as smart as you and your peers. I have been thinking about the "Big Bang" and there is something that bothers me about it. The big bang theory begins with a single event, and everything begins expanding from that point. I look at explosions and everything moves out from a central point. This does not allow anything from the blast to come in contact with each other. This is where I have the problem with the Single event. How can any part, that was ejected from a single event, come in contact with another (eg. two galaxies)? If a galaxy was the result of a single event then it should be moving away from the event on a unique course, shouldn't it? I can only see 3 possible scenarios where two galaxies could collide. 1. Tearing TimeSpace 2. The universe is Finite 3. Multiple Events
Galaxies formed sum time long after the initial bang. In the beginning all was energy. As energy exceeds spacetime constant, space.time.state as matter condenses in verse inflation. Vortices as whirlpools and galaxies tend to draw together only over passage of time. Mass sucks in verse energy blows. gravity in verse levity
Razer - The reason galaxies collide is gravity. As matter rides the wave of inflating spacetime as a result of the so-called big bang, the matter coalesces because of the mutual gravitational force. Clouds of matter (hydrogen at first) become more and more dense. So dense that they start to fuse hydrogen into helium - a star is born! just as the hydrogen coalesces into stars, the stars themselves gravitate toward other stars. Over billions of years, galaxies are defined, usually around a supermassive blackhole. And just as stars gravitate towards each other forming galaxies, galaxies gravitate towards each other forming clusters. And clusters gravitate toward each forming superclusters...
With all this gravitation, matter that would otherwise move in a straight line away from a single point instead move along the curvature of spacetime caused by mass (aka gravity) and matter collides.
