The Universe Is Expanding... But Not Everywhere

The video explains the expanding universe, discovered in the 1920s, and the accelerating expansion revealed by the Hubble Space Telescope in the 1990s. This acceleration is attributed to dark energy, a mysterious force that dominates the universe. Dark energy is thought to be a property of empty space, causing the universe to expand. Despite its dominance, dark energy is weak in small spaces, allowing galaxies to remain unaffected. In the distant future, fewer galaxies will be visible, but our galaxy will remain intact due to gravity's strength over dark energy.

What did the Hubble Space Telescope reveal about distant galaxies?

• They are moving towards us.

• They are stationary.

• They are moving away faster than expected.

• They are shrinking in size.

What is one explanation for dark energy?

• It is a property of empty space.

• It is a form of visible light.

• It is a type of gravitational force.

• It is a form of dark matter.

Why does dark energy not affect galaxies significantly?

• Because dark energy only affects stars.

• Because galaxies are moving too fast.

• Because dark energy is too weak in small spaces.

• Because galaxies are too small.

What will happen to the visibility of galaxies from Earth in the distant future?

• More galaxies will become visible.

• Fewer galaxies will be visible.

• All galaxies will disappear.

• Galaxies will become brighter.

What prevents our galaxy from expanding due to dark energy?

• The presence of dark matter.

• The strong gravitational forces within the galaxy.

• The lack of dark energy in our galaxy.

• The speed of light.