https://padlet.com/williamcul6914/uygw23e0wqqv Made with a wish on a star en-us 2018-08-23 12:29:32 UTC 2018-09-14 12:56:04 UTC hello@padlet.com williamcul6914 https://padlet.com/williamcul6914/uygw23e0wqqv/wish/274830978  - 13.7 Billion years ago universe began
 - Universe began a violent expansion
 - 3 min in - universe size of a grapefruit, energy froze into matter (protons, neutrons, and electrons)
 - several hundred thousand years - Atoms form, early universe about 75% hydrogen and 25% helium
 - 200 to 400 million years - 1st stars and galaxies
 - 4.6 billion years ago - our solar system forms
 - no explosion, it was an expansion 
 - Not a singularity as a little fireball appearing somewhere in space, but there was nothing before 
EVIDENCE
1. Universal Expansion and Hubble's Law
 - majority of galaxies are moving away from each us and each other
2. Back ground radiation
 - Noise radiation (static) is evenly spread across space
3. Quasars 
 - super large (solar system size) galactic cores that put out more light than whole galaxies
 - 10-15 billion light years away, found nowhere else, and nothing exists past them
4. Radioactive Decay
 - gives the age of items from the decay of radioactive materials found within the object
5. Stellar formation and evolution
 - observing the life of stars
6. Speed of light an stellar distances
 - The speed of light is a universal constant of 300,000 km/s
- Furthest stars away are 10-15 billion light years away]]> 2018-08-23 12:30:00 UTC https://padlet.com/williamcul6914/uygw23e0wqqv/wish/274830978 williamcul6914 https://padlet.com/williamcul6914/uygw23e0wqqv/wish/276191116 Distance from sun to Earth (avg) = AU
Planet X Distance (km)/Earth Distance (km) = Planet X AU

]]> 2018-08-29 12:43:04 UTC https://padlet.com/williamcul6914/uygw23e0wqqv/wish/276191116 williamcul6914 https://padlet.com/williamcul6914/uygw23e0wqqv/wish/281260183 2018-09-14 12:30:36 UTC https://padlet.com/williamcul6914/uygw23e0wqqv/wish/281260183