Question

1. watch this video. explain a “light - year.” what is a light - year used for? how long does it take light from the sun to travel to the earth? why do we use light - years instead of kilometers? 6. describe hubble’s law in your own words using the data from this activity.

Explanation:

A light - year is the distance that light travels in one year in a vacuum. It is used to measure vast astronomical distances between stars, galaxies etc. Light from the Sun takes about 8 minutes and 20 seconds to reach the Earth. We use light - years instead of kilometers because in astronomy, distances are extremely large and light - years provide a more convenient and manageable unit for expressing these distances. Hubble's Law states that the farther a galaxy is from us, the faster it is moving away from us, with the velocity of recession being proportional to its distance from us.

Answer:

A light - year is the distance light travels in one year in a vacuum. It is used for measuring large astronomical distances. Light from the Sun takes about 8 minutes and 20 seconds to reach Earth. We use light - years instead of kilometers because astronomical distances are huge and light - years are more convenient. Hubble's Law: The farther a galaxy is, the faster it moves away from us, with recession velocity proportional to distance.