What causes a repeating pattern of day and night? the earth rotates on its axis over 24 hours. the earth orbits, or revolves, around the sun. the sun changes its position around the earth. the earth is facing different parts of the sun as the day goes on.

Paint and solvents pose no potential hazard to human health. select the best answer from the choices provided t f

80 points pls brainliest 1. what does a red shift mean? blue shift? 2. describe the big bang theory. according to this theory, how old is the universe? 3. scientists believe the universe is expanding. what is the evidence that supports this? 4. describe a nebula. 5. describe the 3 types of galaxies. what is a barred spiral galaxy? 6. what is a light year? how far is alpha centauri from earth? 7. describe the universal law of gravitation. be sure to include gravitational force between two objects. 8. describe the planets’ orbits around the sun. 9. what is the asteroid belt? where is it located? 10. describe rotation and revolution of earth. what determines an earth day and year? 11. how do galaxies exist? 12. compare and contrast the inner and outer planets. 13. what causes the seasons?

Ascientific idea becomes valid when it is what?