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AS101 > Assignment #1 > Flashcards

Assignment #1 Flashcards

1
Q

What is a supercluster?

A

a cluster of galaxies bound together by gravity

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2
Q

What is the average distance from Earth to Sun?

A

1 AU

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3
Q

What is the metric system?

A

a decimal system

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4
Q

What is the name of the hazy band of light that circles our sky, produced by the glow of our galaxy?

A

the milky way

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5
Q

What does the Solar System contain?

A

the sun, galaxies, planets, and stars

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6
Q

What is the approximate diameter of the Earth?

A

13, 000 km

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7
Q

How is a planet different from a star?

A

planets reflect light, while stars produce their own light

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8
Q

Describe the Milky Way.

A

it is a spiral galaxy and contains about 100 billion stars

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9
Q

If an object is 1,000 LY away, how do we see it?

A

we see how it looked 1,000 years ago

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10
Q

How does one LY relate to AU?

A

63,000 AU

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11
Q

How many cm are in one km?

A

100, 000 cm

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12
Q

Describe the study of astronomy in ancient times.

A

civilizations around the world used astronomy to help understand their place in the universe

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13
Q

What does a typical galaxy like our Milky Way galaxy contain?

A

stars (with some planets), gas, and dust

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14
Q

Describe the moon.

A

it is an astronomical body

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15
Q

What is one-thousandth of one metre?

A

one millimetre

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16
Q

What is at the centre of the Milky Way?

A

a black hole called Sagittarius

17
Q

What is 5.7 x 10^7 the same as?

A

57 million

18
Q

Approximately how many times larger than the diameter of a typical planet (the Earth) is the diameter of a typical star (the Sun)?

A

100 times

19
Q

Why can’t we see any parts of the universe that are farther than 13.8 billion LY away?

A

light from farther distanced hasn’t had time to reach us

20
Q

If the distance to a star is 450 LY, what can we conclude about the star?

A

the star’s light takes 450 years to reach us

21
Q

How long does it take for light to cross the Milky Way galaxy?

A

about 100, 000 years

22
Q

Why is scientific notation used in science?

A

it makes it easy to write very big or small numbers

23
Q

How does the radius of the Moon’s orbit around the Earth compare to the radius of the Earth?

A

it is 60 times as large

24
Q

What is the implication if the distance to the nearest star is 4.2 LY away?

A

the light we see left the star e.2 years ago

AS101 (3 decks)

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