Big Bang theory

How is a theory different from a guess?

• A theory cannot be disproven; a guess can be

• A theory is backed up by hard evidence; a guess is not

• A theory is agreed upon by scientists; a guess is only agreed on by laypeople

• A theory is usually very old; a guess is usually very new

Where is the center of the universe located?

• There is no center of the universe.

• At the center of the Milky Way galaxy.

• 14.5 billion light years away from Earth.

• In a large singularity near the Andromeda Galaxy.

Which word best describes a singularity?

• a. Large

• b. Cold

• c. Dense

• d. Flammable

What was contained in the singularity that gave rise to the Big Bang? Choose the best answer.

• a. Gamma rays

• b. Electrons in a highly excited state

• c. One atom of every known element in our universe

• d. All the mass, energy, and time in our universe

What do the initial moments after the Big Bang have in common with the universe as it exists now?

• a. All the stars, galaxies, and planets that exist today were formed just a few moments after the Big Bang.

  
  

• b. The universe back then could not sustain life, and it cannot sustain life now.

• c. The universe was extremely hot then, and it is still extremely hot now.

• d. The universe began expanding then, and it is still expanding today.

Place the following in sequence: A) Hubble makes his discoveries; B) Cosmic background radiation is first detected; C) Lemaitre proposes his theory

• a. A, B, C

• b. B, C, A

• c.C,A,B

• d.C,B,A

According to the Big Bang theory, how old is the universe?

• a. 6,000 years

• b. 65 million years

• c. 4.5 billion years

• d. 14.5 billion years

What is one major piece of evidence that the Big Bang theory is correct?

• a. Astronomers have detected leftover radiation from the Big Bang

• b. Everything in the universe has remained in the same location for billions of years

• c. Astronomers have discovered that the universe is no longer expanding

• d. Astronomers have discovered evidence that the universe will soon begin contracting in a "Big Crunch"

What is the best evidence for the Big Bang theory?

• How fast light can travel
• The expansion of the Universe
• Creation of new planets

Red Shift means

• galaxies are moving towards each other
• galaxies are moving away from each other