Topic Twelve Flashcards

(25 cards)

1
Q

What is a constellation?

A

A constellation is a group of stars that is named.

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2
Q

Which inventions allowed astronomers to discover new planets?

A

The telescope, the radio telescope and infrared technology allowed astronomers to do this.

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3
Q

What allows us to get more close-up views of space?

A

Spacecrafts and special instruments allow us to do this.

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4
Q

What is a galaxy?

A

A galaxy is a large collection of stars held together by their natural gravity.

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5
Q

What shapes are galaxies?

A

Galaxies are sometimes spherical shaped, spiral shaped or irregularly shaped.

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6
Q

What are ‘cities of stars’?

A

‘Cities of stars’ are merged galaxies.

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7
Q

What is a theory of how galaxies are formed?

A

One theory is that small lumps of matter clump together to form spiral-shaped galaxies.

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8
Q

What are ellipticals?

A

Ellipticals are formed when smaller galaxies are merged into bigger ones. The stars then wrap around the centre of the galaxy, forming a spherical shape.

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9
Q

What are dwarf galaxies?

A

These are smaller galaxies that have merged together

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10
Q

What is dark matter?

A

Dark matter is matter that does not produce any light, instead it reveals itself through its strong gravitational pull on stars and other objects. 90% of the Milky Way appears to be dark matter.

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11
Q

What is our galaxy called?

A

Our galaxy is called the Milky Way Galaxy.

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12
Q

What is the composition of the Milky Way galaxy?

A

The Milky Way galaxy consists of a thick bulge of stars in the centre with four bright spiral arms and from above it looks like a flat disc.

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13
Q

Where is our sun situated in the Milky Way galaxy?

A

It is located near the edge of one of the spiral arms.

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14
Q

How big is the Milky Way galaxy?

A

It is 100000 light years in diameter and 2000 light years thick

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15
Q

What is our closest star?

A

Our closest star is the sun.

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16
Q

What protects us from the harmful rays of the sun?

A

The ozone layer does this.

17
Q

Which is our nearest star system?

A

Alpha Centauri is our nearest star system

18
Q

Where is Alpha Centauri?

A

It is the brighter of the two pointer stars of the Southern Cross. It forms part of the constellation Centaurus.

19
Q

What is the closest planet outside our galaxy that circles a sun?

A

Alpha Centauri B has an unamed as yet planet circling it.

20
Q

What is the unit of measurement used for distances in space?

21
Q

What is a light year?

A

A light year is the distance that light travels in a year.

22
Q

What was the name of the first galaxy discovered outside our solar system?

A

It was called the City of Stars.

23
Q

What is the Local Group?

A

It is a group of about 45 galaxies that surround the Milky Way.

24
Q

What is a merger?

A

A merger is galaxy that will become part of another galaxy.

25
What is the estimated age of the universe?
The universe is estimated to be 13.7 billion years old.