The Universe

1.      The universe is somewhere between 10 and 20 billion years old.  The last best consensus is about 13.7 billion years.

 

There might be other universes and/or other dimensions.

 

 

2.      Not including planets, the Sun is one of 100 to 400 billion stars in our galaxy, the Milky Way.  There may be about 140 billion galaxies. 

 

Before 1923, no one knew there were any other galaxies.

 

 

3.      Carl Sagan calculated there could be 10 billion trillion planets in the universe of which we have found a few thousand.

 

If each star in the Milky Way has an average of one planet each, and one tenth of one percent of them has an environment that could support life (meaning 99.99% do not), there could be at least 200,000 planets in our galaxy that could be inhabited by human beings.

 

The problem is traveling to one.

 

 

4.      Everything in the universe is made of atoms, which are not visible to the human eye.

 

When something living dies or when an inanimate object disintegrates, the atoms that it was comprised of become part of something else.

 

Chances are that today’s atoms have been in existence since the beginning of the universe and possibly beforehand.

 

There is a possibility that today’s atoms may continue to exist after the currently known universe doesn’t exist anymore.