Understanding the Universe

What is the approximate distance light travels in one year?

• 9 trillion kilometers

• 1 quintillion kilometers

• 100 billion kilometers

• 1 trillion kilometers

How wide is the Milky Way galaxy in light years?

• 46 billion light years

• 100,000 light years

• 2.5 million light years

• 8 light hours

What is the estimated diameter of the observable universe?

• 13.8 billion light years

• 90 billion light years

• 100,000 light years

• 46 billion light years

What analogy is used to explain the expansion of space?

• A balloon being inflated

• A loaf of raisin bread rising

• A sponge soaking up water

• A rubber band stretching

What happens to light as space expands?

• It changes direction

• Its wavelength stretches

• Its wavelength shortens

• It becomes brighter

What is the term used to describe the stretching of light's wavelength due to space expansion?

• Doppler effect

• Light bending

• Redshift

• Blueshift

How is the expansion history of the universe determined?

• By counting the number of galaxies

• By measuring the speed of light

• By observing the color of stars

• By analyzing cosmological redshift

What is the current estimated age of the universe?

• 4.5 billion years

• 13.8 billion years

• 46 billion years

• 100 billion years

What concept is used to explain the universe's expansion from a single point?

• The Big Crunch

• The Big Bang

• The Steady State Theory

• The Multiverse Theory

What is the Fermi paradox concerned with?

• The existence of alien life

• The expansion of the universe

• The speed of light

• The age of the universe