2-8+Cosmic+Voyage

1. What is the simple scale we use everyday to determine what is large and small? - human size 2. What did most people assume was the center of the unchanging universe? - the earth 3. What did Galileo see on the moon with his telescope? - mountains 4. What is represented by each of these following circle sizes? - something with hoola hoops 1 meter = 1000 meters or 1 kilometer = 6 powers of 10 (1 x 10 6 meters) = 8 powers of 10 (1 x 10 8 meters) = 13 powers of 10 (1 x 10 13 meters) = 5. What is a light year? - how fast light travels 6. How many years would traveling to the nearest star take? - 4.2 light years 7. What did Anton van Leeuwenhoek invent? - the microscope 8. What is one of the two particles inside the nucleus of an atom? - Neutron 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 12. Why are black holes called “black holes”?