P6.2.3 - Galaxies and the Universe

Question 1

What are galaxies each made up of? [1]

Answer 1

many billions of stars

Question 2

What is the sun in a galaxy? [1]

Answer 2

the sun is a star in the galaxy known as the Milky Way

Question 3

Other stars that make up the Milky Way are what from the Earth? [2]

Answer 3

they are much further away from the Earth than the sun is from the Earth

Question 4

What is the Milky Way? [1]

Answer 4

• one of many billions of galaxies making up the Universe

Question 5

What is the diameter of the Milky Way? [1]

Answer 5

approximately 100,000 light-years

Question 6

What does the Big Bang Theory state? [3]

Answer 6

• the universe expanded from a single point of high density and temperature
• the universe is still expanding
• the universe is approximately 13.8 billion years old