cosmic+voyage

. What is the simple scale we use everyday to determine what is large and small? -ourselves 2. What did most people assume was the center of the unchanging universe? -earth 3. What did Galileo see on the moon with his telescope? -it had mountains 4. What is represented by each of these following circle sizes? 1 meter =a hula hoop 1000 meters or 1 kilometer =city center 6 powers of 10 (1 x 10 6 meters) =earth 8 powers of 10 (1 x 10 8 meters) =moon 13 powers of 10 (1 x 10 13 meters) =entire solar system 5. What is a light year? -the distance light travels in a entire year 6. How many years would traveling to the nearest star take? -5 light years 7. What did Anton van Leeuwenhoek invent? -microscope 8. What is one of the two particles inside the nucleus of an atom? -protons 9. How long would the collision of two galaxies really last? -a billion years 10. What is the name for exploding stars? -super nova 11. What is the bacteria that is thought to have first produced oxygen called? -blue green bacteris 12. Why are black holes called “black holes”? -because they are black and they swallow everything