Ared supergiant star is ten times more massive than the sun. what would be the likely impact on the motion of earth if the sun were replaced by this red supergiant? a year on earth would be shorter because earth's orbital speed would increase. a year on earth would be shorter because earth's orbital speed would decrease. a day would be longer because the gravity experienced by earth would be stronger. a day would be longer because the gravity experienced by earth would be weaker.

20 point pls brianliest 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?