Unit 3 Big Bang Theory Review

What is the approximate age of the universe?

13.8 billion years old

What did Edwin Hubble discover in the 1920’s?

Galaxies are moving away from each other

Who first proposed the Big Bang theory in 1927?

Georges Lemaître

When Penzias and Wilson first discovered the cosmic microwave background radiation, what was it mistaken for?

Noise from the city

How will the universe definitely end?

We do not know for sure.

Which theory suggests that the universe has always existed and will continue to exist indefinitely

Steady State theory

What direction is the object moving if the radial velocity is a positive number?

away from the observer

What direction is the object moving if the radial velocity is a negative number?

toward the observer

These are mysterious objects in the universe that are not yet completely understood but are having a profound impact on the universe.

dark matter and dark energy

What impact does dark energy have on the universe?

Making the universe expand faster than we thought it would

What is happening to the rate of acceleration in the universe?

It is increasing

Is the primeval atom still a concept in modern cosmology?

Yes

This is the leftover radiation from just after the Big Bang.

cosmic microwave background radiation

What evidence supports the idea that the universe is expanding?

supernovae appearing fainter than expected

Which theory proposes a repeating cycle of expansion and contraction of the universe?

cyclic universe theory

This theory proposes the universe is made from multiple universes with each possibly having their own sets of laws and features.

The multiverse theory

Which event happened first? Polaris forming or our sun forming

Polaris formed first

Which event happened first? Polaris forming or the Milky way galaxy forming

Milky Way Galaxy formed first

Which formed first? The sun or the Milky way galaxy

Milky way galaxy

What was the first event of the Big Bang?

expansion from a singularity

Which end of the universe scenario predicts the universe will stop expanding and begin contracting

The Big Crunch

What is the diamter of the observable universe?

93 billion light years

What are the 4 assumptions of the Big Bang Theory?

The universe has a beginning, it is constant, it is homogenous and we are not the center

What does redshift mean?

The phenomenon where light from distant galaxies is shifted to longer wavelengths, indicating that they are moving away from us