The Sky in 350 Billion Years

The video explores the concept of the expanding universe, discussing how it can be both larger and smaller simultaneously. It delves into the historical context of Edwin Hubble's discovery, the role of redshift, and the observable universe's boundaries. The video also examines the implications of the universe's expansion, including the concept of dark energy and its potential impact on the universe's future.

What paradox is presented about the universe in the introduction?

• The universe is both heating and cooling.

• The universe is both getting larger and smaller.

• The universe is both visible and invisible.

• The universe is both expanding and contracting.

What significant discovery did Edwin Hubble make at the Mount Wilson Observatory?

• The existence of black holes.

• The formation of stars.

• The presence of dark matter.

• The expansion of the universe.

What is the significance of redshift in understanding the universe?

• It indicates the temperature of stars.

• It shows the chemical composition of galaxies.

• It demonstrates the speed at which galaxies are moving away.

• It reveals the age of the universe.

How does the analogy of stickers on a slinky help explain the universe's expansion?

• It demonstrates how galaxies are merging.

• It shows how galaxies are stationary while space expands.

• It illustrates how galaxies are moving towards each other.

• It explains how galaxies are shrinking over time.

What defines the boundary of the observable universe?

• The speed of sound and the age of the universe.

• The speed of light and the age of the universe.

• The gravitational pull and the size of the universe.

• The temperature and density of the universe.

Why can't we see galaxies beyond the observable universe?

• They are hidden by cosmic dust.

• They are moving towards us.

• Their light hasn't reached us yet.

• They are too small to detect.

What is dark energy believed to be responsible for?

• The slowing down of the universe's expansion.

• The acceleration of the universe's expansion.

• The creation of new galaxies.

• The destruction of black holes.

What is one possible future scenario for the universe due to dark energy?

• The universe will collapse into a singularity.

• The universe will continue expanding indefinitely.

• The universe will reverse its expansion.

• The universe will remain static.

What is the 'heat death' of the universe?

• A scenario where the universe collapses into a black hole.

• A scenario where the universe heats up and explodes.

• A scenario where the universe stops expanding.

• A scenario where the universe expands and cools indefinitely.

What percentage of the universe is believed to be made up of dark energy?

• 90%

• 70%

• 50%

• 30%