Cosmos
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- What is our physical place in the universe
- Earth, solar system, Milky Way Galaxy, Local Group, Super Cluster
- How far is a light-year and a light minute
- Light year- 300,000km/s Light minute- ?
- How did we come to be?
- The big bang and the expanding universe - Entire universe is expanding - Big Bang occured about 14bill years ago
- How big is Earth compared to our solar system?
- If the sun is the size of a grape fruit, the Earth would be the size of a ball point pen **
- How far away are the stars?
- 4.4 light-years away(Alpha Centauri)
- How big is the Milky Way Galaxy?
- 100,000 light year diameter
- How big is the universe
- 100bill stars/galaxy, 100bill galaxies in the universe = 10^22 stars in the universe. - Roughly equivalent to the number of dry grains of sand on the Earth
- How is Earth moving in our solar system?
- - Daily ROTATION(spin) - Yearly ORBIT(revolution) Earths average orbital distance = Astronomical Unit (AU) = 150mill km(93mill mi) - AU = distance from sun
- How is our solar system moving in the Galaxy?
- I have no idea (pg16)
- How do galaxies move within the universe?
- - Milky Way Galaxy(28,000ly away from galactic center) completes one orbit of the galaxy in about 230mill years