Cosmology and the Future of the Universe

Katie Mack discusses the expansion of the universe, which is accelerating due to dark energy, a concept linked to Einstein's cosmological constant. This expansion leads to the heat death, or Big Freeze, where the universe becomes cold and empty. Over time, entropy increases, leading to a state where no organized information or processes can occur. Mack explains these concepts in the context of cosmology, exploring the universe's past, present, and future.

What happens to galaxies as the universe expands?

• They collapse into black holes.

• They move closer to each other.

• They remain stationary.

• They move away from each other.

What is Katie Mack's field of study?

• Particle Physics

• Astrology

• Cosmology

• Quantum Mechanics

What is causing the universe's expansion to accelerate?

• Galactic collisions

• Black holes

• Dark matter

• Dark energy

What is the cosmological constant?

• A measure of the universe's density

• The gravitational pull of black holes

• An inherent stretchiness in space

• The speed of light

What is the heat death of the universe?

• A sudden freeze

• A massive explosion

• A cold, dark ending

• A fiery collapse

What does the second law of thermodynamics state?

• Entropy in the universe decreases over time.

• Energy is always conserved.

• Energy can be created or destroyed.

• Entropy in the universe increases over time.

What will happen to distant galaxies in the future?

• They will become more visible.

• They will disappear from view.

• They will merge into one.

• They will form new stars.

What is expected to happen to stars in a trillion years?

• They will merge into black holes.

• They will become brighter.

• They will explode.

• They will stop forming.

How long will it take for the smallest black holes to evaporate?

• 10 to the power of 100 years

• 10 to the power of 65 years

• 10 to the power of 20 years

• 10 to the power of 10 years

What happens when particles decay in the universe?

• Galaxies collide.

• No information can be organized.

• New stars are formed.

• Black holes are created.