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

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Flashcards in 9/10/18 The Size of the Universe / The History of the Universe Deck (16)
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1

diameter of Earth

about 10E4 km

2

distance from Sun to Earth

-1.5E8 km
-1 AU

3

distance from Sun to Pluto

40 AU

4

size of solar system

60 AU

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?

a ball point

6

How many stars does the Milky Way have?

100 billion

7

How many galaxies are there?

100 billion

8

There are as many stars as what?

Grains of dry sand on all Earth's beaches

9

radius of the observable universe

14 billion lightyears

10

Why does the universe expand?

the Big Bang

11

how are galaxies formed?

gravity pulls matter together

12

What elements did the early universe contain? (2)

H, He

13

How were the other elements made?

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

14

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

the solar system was born

15

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

inside stars that died before Earth formed

16

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

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