Astronomy Flashcards

1
Q

Earths rotation takes about

A

24 hours

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2
Q

One complete revolution of earth around the sun takes about

A

One year (365 days)

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3
Q

The phase of the moon you see depends on

A

How much of the sunlit side of the moon faces earth

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4
Q

Tides are caused mainly by

A

Differences in how much the moon pulls on different parts of earth

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5
Q

How large is the moon compared to earth?

A

About one-fourth he diameter of earth

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6
Q

You are less likely to see a total solar eclipse than a total lunar eclipse because

A

The moons shadow only covers a small area on earths surface

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7
Q

During a total lunar eclipse, the order if the objects would be

A

Sun, earth, moon

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8
Q

A light year is

A

The distance light travels in a year

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9
Q

The lifetime of a star depends on it’s

A

Mass

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10
Q

The Milky Way galaxy is an example of a

A

Spiral galaxy

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11
Q

The solar system formed from

A

A giant cloud of gas and dust

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12
Q

Venus and earth are much alike in terms of

A

Their size and density

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13
Q

Uranus is different from most other planets because it

A

Rotates on it’s side

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14
Q

Characteristics used to clarify stars include

A

Size, brightness, and temperature

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15
Q

What color are the coolest stars?

A

Red

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16
Q

The absolute brightness of a star depends on it’s

A

Size and temperature

17
Q

The Hertzsprung-Russell diagram shows main-sequence stars

A

Increase in brightness as they increase in temperature

18
Q

Which planet takes more time to complete one rotation on it’s axis than to complete one revolution around the sun?

A

Venus

19
Q

Why is there a North Star but not a south star?

A

Just by chance there is a bright star near the north celestial pole

20
Q

If you were at a latitude of N5 degrees, the North Star would appear to be

A

On the horizon, rising and falling

21
Q

What do all of the inner planets have in common?

A

They all are small and have rocky surfaces

22
Q

Astronomers predicted the existence of the asteroid belt based on

A

The great gap between mars and Jupiter

23
Q

Order of the planets from the sun

A

Mercury, Venus, Earth, Mars, Asteroid Belt, Jupiter, Saturn, Uranus, Neptune, Kuiper Belt, Pluto, Charon

24
Q

The half-way planet

A

Uranus