Unit 1 set 2 the universe

Question 1

Big Bang Theory

Answer 1

the Big Bang is a THEORY about the creation of the UNIVERSE

Question 2

Big Crunch Theory

Answer 2

a theory that says that the universe will stop expanding outward, reverse direction, and pull back on itself to the single point

Question 3

Nebula

Answer 3

an enormous cloud of dust and gas occupying the space between stars and acting as a nursery for new stars

Question 4

Nebular Hypothesis

Answer 4

the theory that the solar system evolved from a mass of nebular matter

Question 5

Primordial atom

Answer 5

the initial ‘seed’ of the beginning of the universe proposed by Georges Lemaitre. Data suggests the age at 10 - 20 billion years, which would be the age of the universe

Question 6

Milky Way

Answer 6

the galaxy to which Earth and other components of our Solar System belong

Question 7

Stars

Answer 7

the most widely recognized astronomical objects, and represent the most fundamental building blocks of galaxies

Question 8

Galaxy

Answer 8

a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.