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Astronomy 110 > Chapter 1 & 2 > Flashcards

Chapter 1 & 2 Flashcards

0
Q

How old is the universe?

A

14 billion years old.

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1
Q

What is an expanding universe?

A

The idea that space between a galaxies or clusters of galaxies is growing with time.

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2
Q

What is an astronomical unit?

A

The average distance between Earth and the sun (150 million km).

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3
Q

What is a light year?

A

The distance that light can travel in a year, which is about 9.46 trillion km.

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4
Q

What is a rotation?

A

The spinning of an object on it’s axis.

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5
Q

What is an orbit/revolution?

A

The motion of one object around another.

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6
Q

What is a constellation?

A

The region of the sky with well defined borders.

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7
Q

What is the brightest star?

A

Sirius.

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8
Q

What is the closest star?

A

Centauri.

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9
Q

What is the pole star?

A

Polaris; the star that is aligned with the earth’s axis of rotation.

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10
Q

What causes the seasons?

A

The tilt of the Earth’s axis causes sunlight to fall differently on Earth during different times of year.

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11
Q

When is the summer equinox?

A

Around June 21st.

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12
Q

When is the spring equinox?

A

Occurs around march 21st.

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13
Q

When is winter solstice?

A

Around December 21st.

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14
Q

When is fall equinox?

A

Around September 22nd.

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15
Q

What is a lunar eclipse?

A

When the Earth lies directly between the Sun and the moon, so that the earths shadow falls on the moon.

16
Q

What is a solar eclipse?

A

When the moon lies directly between the sun and earth, so that he moons shadow falls on Earth. People living within the area covered by the moons shadow will see the sun blocked or partially blocked from view.

17
Q

What phase of the Moon is this?

A

Waning crescent

Rise: 3 AM

Highest: 9 AM

Set: 3 PM

18
Q

What phase of the moon is this?

A

Third Quarter

Rise: Midnight

Highest: 6 AM

Set: Noon

19
Q

What phase of the moon is this?

A

Waning Gibbous

Rise: 9 PM

Highest: 3 AM

Set: 9 AM

20
Q

What phase of the moon is this?

A

Full moon

Rise: 6 PM

Highest: Midnight

Set: 6 AM

21
Q

What phase of the moon is this?

A

Waxing Gibbous

Rise: 3 PM

Higest: 9 PM

Set: 3 AM

22
Q

What phase of the moon is this?

A

First Quarter

Rise: Noon

Highest: 6 PM

Set: Midnight

23
Q

What phase of the moon is this?

A

Waxing Crescent

Rise: 9AM

Highest: 3 PM

Set: 9 PM

Astronomy 110 (3 decks)

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