Understanding the Expanding Universe

If a galaxy's light takes 25,000 years to reach us, how far is it from us?

• 25,000 light years

• 32,000 light years

• 13.4 billion light years

• 46.5 billion light years

What is the current estimated size of the observable universe?

• 13.8 billion light years

• 32 billion light years

• 46.5 billion light years

• 14 billion light years

What is the Hubble Sphere?

• The edge of the Milky Way

• The boundary of the observable universe

• The center of the universe

• A region where galaxies move away faster than light

Can we see galaxies that are moving away from us faster than the speed of light?

• No, they are beyond the cosmic event horizon

• Yes, as they are now

• Yes, but only as they were in the past

• No, we can never see them

What is the cosmic event horizon?

• The edge of the Milky Way

• The boundary of the observable universe

• The limit beyond which we can never receive information

• The center of the universe

What happens to light from galaxies moving faster than light due to expansion?

• It never reaches us

• It moves away and then comes back

• It stops moving

• It accelerates infinitely

What is the significance of the Hubble parameter?

• It measures the speed of light

• It determines the rate of expansion of the universe

• It is the size of the Milky Way

• It is the distance to the nearest galaxy

How does the expansion of space affect the movement of galaxies?

• Galaxies remain stationary

• Galaxies move apart faster than light

• Galaxies collapse into black holes

• Galaxies move closer together

What is the relationship between distance and speed of galaxies moving away from us?

• All galaxies move at the same speed

• Closer galaxies move faster

• Farther galaxies move faster

• Farther galaxies move slower

Why don't objects expand as the universe expands?

• Because space has friction

• Because local forces like gravity counteract expansion

• Because they are too small

• Because they are not in space