Card Set Information
How can we know if what we are being told is true?
As all that is. Not just everything, but all space and time and all stuff in that space and time. We have to imagine this since we don't know if we have detected all that is.
As all that we have detected. We can limit the definition to what we have observed or detected and that puts a different twist on things.
The universe (the space time itself) is expanding.
How galaxies (islands of stars) move
Most of the matter in the universe (80%) is dark matter
What do we call the unkown reason for galaxies spinning in an unexpected way?
What do we call the unknown reason for our entire universe
How much is a Billion?
1 with 9 zeroes
1 Billion= 1,000,000,000 = 1x10
1 Milion= 1,000,000 =1x10
1 Thousand= 1,000 =1x10
1 Thousand Seconds
1 Million Seconds
1 Billion Seconds
Grouping in Space
Group of stuff -> space -> Bigger group of stuff -> bigger expansion of space and so on...
Nucleus of an Atom
Group of tiny protons and neutrons
Protons, neutrons, electrons
Group of atoms
Group of people
Group of all the stuff going around our star called the "sun"
Group of Stars
open clusters and globular clusters of stars
Big "island" group of stars
Groups of galaxies
Larger groups of galaxies
Who was the first to come up with the idea of the Big Bang Theory? When was that?