Earth Science S1 : 1 Two

1 Big Bang Theory 2. Inflation Theory 3. Oscillating Universe Theory 4. Steady State Theory.

1. A tiny, dense, very hot fireball exploded and expanded. Then matter began to form and clump together, creating galaxies. The universe continues to expand. 2. The big bang really happened. But within milliseconds, the universe expanded or inflated so rapidly that the universe is flat and uniform 3. With every big bang, there comes a big crunch. We are on a never-ending cycle of an expanding and contracting universe.

1 Big Bang Theory 2. Cosmological Principle 3. Cosmologist 4. Cosmology 5. Galaxy 6. General Relativity Theory 7. Inflation Theory 8. Isotropic 9. Oscillating Universe Theory 10. Perfect Cosmological Principle 11. Quasars 12. Steady State Theory

1. Suggests the origin of the universe started with an explosion and expansion of a very hot, dense, compact fireball. 2. The universe looks the same at any location, but can change over time. 3. Scientist who studies the origin and structure of the universe. 4. The study of the origin and structure of the universe. 5. A large-scale collection of stars, dust, and gas held together by gravity 6. Albert Einstein's theory that space and time are relative to matter. 7. Theory that upholds the big bang theory, but suggests there was an extremely rapid expansion milliseconds after the big bang. 8. Identical in all directions. 9. Theory about the origin of the universe that suggests the universe is a never-ending cycle of expansion and contraction. 10. Steady state theorists' belief that the universe looks the same in the past, present, and future, and does not change over time. 11. The oldest and farthest celestial bodies of the universe. 12. Theory about the origin of the universe that suggests the universe has been and will continue to be as it is now.

According to the big bang theory, how long ago did the universe begin?

13 to 15 billion years ago.

According to the big bang theory, after the "bang," the universe remained dark until about *BLANK* later, when neutral atoms began to form.

300,000 years

The big bang theory suggests that the origin of the universe began with *BLANK* that exploded and expanded.

A compact fireball.

According to the big bang theory, the universe was once a very *BLANK* and hostile place.

Hot.

Lemaitre (based on Hubble's observations) was the first to suggest the _____.

Big bang theory.

Scientists who study the origin and structure of the universe are known as _____.

Cosmologists.

The most recent theory that upholds the big bang theory, but suggests a sudden expansion after the bang, is called the _____.

Inflation theory.

Which theory explains why our universe is structured and uniform and suggests that the universe is flat in shape?

Inflation theory.

Mr. Tolman believes that our universe is expanding, but with all of the gravitational force from the celestial bodies of space, the universe will begin to contract. He believes in the _____.

Oscillating universe theory.

This theory suggests that for every big bang, there is a big crunch.

Oscillating universe theory.

Mr. Biggins believes that the universe has been and always will look and be structured the same throughout all time. He supports the *BLANK* principle.

Perfect Cosmological.

Mr. Bondi suggests there doesn't have to be some chaotic event, such as an explosion, to explain the origin of the universe. Our universe was and just is. It looks the same from every location and does not change. Mr. Bondi believes in the _____.

Steady state theory.

This theory lost its appeal when astronomers discovered quasars and cosmic background radiation.

Steady state theory.

Despite a lot of scientific evidence and many theories why does the origin of the universe remain a question to scientists? Select all that apply.

T- Because there is not enough evidence to prove any one theory. T - Because no one was there to witness it, so it can never be proven. Because there are many competing theories that explain the evidence. Because none of the evidence supports the theories.

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study it?

The cosmological principle makes assumptions that provide scientific guidelines to enable its study.

According to the Big Bang Theory, matter clumped into stars because of _____?

The force of gravity.

Which statement is true?

The perfect cosmological principle is the basis for the oscillating universe theory. The oscillating universe theory suggests that the universe will expand forever. The perfect cosmological principle is the basis for the big bang theory. T - The perfect cosmological principle is the basis for the steady state theory.

Big Bang theorist believe_____?

The universe started with an explosion and expansion of a very hot, dense, compact fireball.