What does Hubble's Law mean?The recommended time to answer this question is 2.5 minutes.Soru 23YanıtAll galaxies are moving away from us at a constant speed.The further a galaxy is, the slower it moves away from us.The further a galaxy is, the faster it moves away from us.The further a galaxy is, the faster it approaches us.All galaxies approach us at a constant speed.

Hubble's Law, named after the American astronomer Edwin Hubble, is a fundamental principle in cosmology that states: "The further a galaxy is, the faster it moves away from us." This law is a direct result of the universe expanding.

Here's a step-by-step explanation:

1. Hubble's Law is based on observations of distant galaxies. Hubble noticed that galaxies appeared to be moving away from us, which he determined by looking at their light.

2. The light from these galaxies was shifted towards the red end of the spectrum, a phenomenon known as redshift. This happens because as an object moves away from us, the light it emits appears to 'stretch', moving towards the longer wavelength, red end of the spectrum.

3. Hubble found that the further away a galaxy was, the more its light was redshifted. This led him to conclude that the further a galaxy is, the faster it is moving away from us.

4. This observation supports the theory of an expanding universe. If all galaxies are moving away from each other, it suggests that the universe itself is getting bigger.

5. The rate at which a galaxy is moving away from us is known as the Hubble Constant. This is used to estimate the age of the universe.

So, the correct answer to your question is: "The further a galaxy is, the faster it moves away from us."