Space Flashcards

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1
Q

The sun, the planets, and smaller bodies

A

Solar system

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2
Q

A group of millions or billions of stars held together by their own gravity

A

Galaxy

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3
Q

Everything, space and all the matter and energy in it

A

Universe

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4
Q

An object that orbits a more massive object

A

Satellite

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5
Q

When an object strikes the surface of a larger object in space it explodes and leaves behind a round pit

A

Impact crater

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6
Q

The earth rotates around an imaginary line through it’s center

A

Axis of rotation

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7
Q

The motion of one object around another

A

Revolution

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8
Q

Patterns of temperature changes and other weather trends over the course of the year

A

Season

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9
Q

Sunlight shines on the southern and northern hemispheres

A

Equinox

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10
Q

A dark spot on the moon

A

Mare

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11
Q

Occurs when a shadow makes the sun or moon seem to grow dark

A

Eclipse

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12
Q

Is the darkest part

A

Umbra

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13
Q

Around the umbra is a spreading cone of lighter shadow

A

Penumbra

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14
Q

Is earth’s average distance from the sun

A

Astronomic unit

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15
Q

The shape of each orbit

A

Ellipse

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16
Q

Are Mercury, Venus, Earth, and Mars-the closest planets to the sun

A

Terrestrial planet

17
Q

Are Jupiter, Saturn, Uranus, and Neptune-are made of mainly hydrogen, helium, and other gases

A

Gas giant

18
Q

Small, solid rocky bodies that orbit close to the sun

A

Asteroid

19
Q

A body that produces a coma of gas and dust

A

Comet

20
Q

A brief streak of light produced by a particle entering earth’s atmosphere at a high speed

A

Meteor

21
Q

A small object from outer space that passes through earth’s atmosphere and reaches the surface

A

Meteorite

22
Q

Having or representing the earth as the center

A

Geocentric

23
Q

Having or representing the sun as the center

A

Heliocentric

24
Q

The force that objects exert on each other because of their mass

A

Gravity

25
Q

The alternative rising and falling of the sea

A

Tide

26
Q

The moon at any time after a new moon, and before full moon

A

Waxing

27
Q

The moon at any time after a full moon and before new moon

A

Waning

28
Q

Of the moon or a planet:seen with more than half, but not all of the apparent disk illuminated

A

Gibbous moon

29
Q

The shape of the visible part of the moon when it is less than half full

A

Crescent moon

30
Q

The moon with it’s whole apparent disk illuminated

A

Full moon

31
Q

The phase of the moon when it is in conjunction with the sun and invisible from earth,or shortly thereafter when it appears as a slender crescent

A

New moon

32
Q

The moons phase when it is in conjunction with the sun so that it’s dark side is toward the earth

A

Quarter moon

33
Q

The path of an object as it moves around another object because of the gravity

A

Orbit

34
Q

Longest and shortest days during the year

A

Solstice

35
Q

When day and night are equally

length

A

Equinox