Astronomy/ The Universe Flashcards Preview

Science Yr 9&10 > Astronomy/ The Universe > Flashcards

Flashcards in Astronomy/ The Universe Deck (17):
1

What is the Big Bang Theory? Explain.

A thoery which explains how the Universe was formed.
A region of energy exploded outward. Matter was later formed from this energy. Matter condensed into starts because of gravity.

2

When light from distant stars are moving away from Earth, what does it produce?

A 'red shift' in the light coming from the stars.

3

What did Edward Hubble discover?

The universe is expanding.

4

What did planets form from?

Stardust

5

What do stars form from?

Stardust and gases collected by gravity.

6

What are distances in space measured in?

Light years

7

What is a light year?

Distance light travels in one year.

8

How fast does light travel per second through space?

300 000km/ sec

9

What radiation do stars release?

Electromagnetic radiation, which include gamma rays, X- rays, U.V, light, infra- red, microwaves and radiowaves.

10

What does nuclear fusion in the star's core do?

Converts hydrogen fuel into helium and heavier elements.

11

What surface temperature does a blue/ white star have?

20 000 degrees Celsuis

12

What surface temperature does a yellow star have?

5000 degrees Celsuis (e.g. our Sun)

13

What surface temperature does a red star have?

3000 degrees Celsuis

14

How can the elements in a star by determined?

By studying the light spectrum they give off.

15

Describe the life of stars.

Refer to science book :D

16

What does a black hole result from?

The death of a massive star that produces a supernova explosion. The core fo the star collpases inward creating a black hole. The matter is very dense with enormous gravity pull.

17

What is a galaxy?

A cluster of stars in the universe.