How Big is the Universe

The video explains the difference between the observable universe and the whole universe. The observable universe is the region of space visible from Earth, currently 93 billion light years across, due to the expansion of space. The whole universe is likely infinite. The observable universe has a center, which is us, but the whole universe does not. The universe is expanding, making both the observable and whole universe larger over time. As the universe ages, we see older light from farther away, expanding our view of the cosmos.

What defines the observable universe?

• The region of space visible from Earth

• The age of the universe

• The total mass of the universe

• The number of galaxies in the universe

Why is the observable universe not 27.5 billion light years across?

• Because the universe is shrinking

• Because the universe is younger than we thought

• Because space has been expanding over time

• Because light travels faster than expected

How does the size of Earth compare to the observable universe?

• It is as large as the solar system

• It is as large as a galaxy

• It is as small as a star

• It is as small as a virus within the solar system

What is the center of the observable universe?

• The Sun

• The Big Bang

• The Milky Way

• Each observer

Is the universe getting bigger, and if so, how?

• Yes, through the addition of new galaxies

• No, it is static

• Yes, through the expansion of space

• No, it is contracting