I keep hearing different numbers for the count of stars in our galaxy. I have heard everything from 100 billion to 400 billion. I wonder which it is.
Scientists estimate there are more than 100 billion galaxies in the Universe, the structures they form all looking very similar, at a very large scale, to styrofoam. Why?
When we're in our homes, we feel safe, secure, and sheltered. We don't realize, understand, or react to the fact that there is nothing between us and things that could destroy us but space. There are trillions of iceballs and asteroids out there that could end it all, here on Earth. And, someday, something "out there" will visit us "here" and all life on Earth will cease to exist. It is not a question of IF, but WHEN. The only hope that mankind has for survival is to send children of this planet out into space to colonize other places, other worlds, moons and planetoids. The longer it takes us to do so, the greater the chance that we won't survive.
If equal amounts of matter and antimatter were formed in the big bang, why is there matter, at all? So, okay. There was matter left after the great antimatter/matter annihilation. What happened to all the energy released when they annihilated? Given the Law of the Conservation of Energy, where is it? Is that the Dark Energy that's supposedly causing the continued expansion of the Universe?