9/10/18 The Size of the Universe / The History of the Universe

Question 1

diameter of Earth

Answer 1

about 10E4 km

Question 2

distance from Sun to Earth

Answer 2

• 1.5E8 km

- 1 AU

Question 3

distance from Sun to Pluto

Answer 3

40 AU

Question 4

size of solar system

Answer 4

60 AU

Question 5

If the Sun was the size of aa large grapefruit, how big is Earth; an atom, a ball point, a marble, a golf ball?

Answer 5

a ball point

Question 6

How many stars does the Milky Way have?

Answer 6

100 billion

Question 7

How many galaxies are there?

Answer 7

100 billion

Question 8

There are as many stars as what?

Answer 8

Grains of dry sand on all Earth’s beaches

Question 9

radius of the observable universe

Answer 9

14 billion lightyears

Question 10

Why does the universe expand?

Answer 10

the Big Bang

Question 11

how are galaxies formed?

Answer 11

gravity pulls matter together

Question 12

What elements did the early universe contain? (2)

Answer 12

H, He

Question 13

How were the other elements made?

Answer 13

When stars run out of fuel, they explode, scattering the elements into space that they made during nuclear fusion

Question 14

When 2% of H and He had been converted into heavier elements, what occurred?

Answer 14

the solar system was born

Question 15

Where was most of the material that makes up the Earth and all life on Earth, including humans, formed?

Answer 15

inside stars that died before Earth formed

Question 16

How have space/galaxies/clusters been moving since the Big Bang?

Answer 16

Space has continued to expand with clusters of galaxies moving away from each other, but stars emaining in galaxies and galaxies remaining in clusters