Planets Vocabulary Flashcards

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1
Q

Orbit

A

The circular path of an object as it revolves around another object.

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2
Q

Solar System

A

A system of objects that revolve around a star.

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3
Q

Galaxy

A

A group of solar systems, dust, and gas held together with gravity.

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4
Q

Universe

A

Space and all the matter in it.

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5
Q

Satellite

A

A celestial body orbiting the earth or another planet.

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6
Q

Impact Crater

A

A crater on a planet or moon caused by the impact of a planet or moon caused by the impact of a meteorite or other object, typically circular with a raised rim.

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7
Q

Rotation

A

The action of rotating around an axis or center.

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8
Q

Revolution

A

A forcible overthrow of a government or social order, in favor of a new system.

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9
Q

Meteorite

A

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

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10
Q

Quarter Moon

A

Half of the moon is illuminated.

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11
Q

New Moon

A

The entire surface of the moon is not illuminated.

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12
Q

Astronomical Unit

A

Average distance from the sun which is 93,000,000 miles

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13
Q

Revolution

A

The motion of one body around another, such as the Earth in its orbit around the Sun.

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14
Q

Crescent Moon

A

The illuminated surface is less than a quarter

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15
Q

Perumbrella

A

A region of lighter shadow that may surround a dark central region.

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16
Q

Mare

A

A large dark plain of solidified lava on the moon

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17
Q

Galaxy

A

Millions and billions of stars held together in a group by their own gravity.

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18
Q

Umbra

A

The dark central region of a shadow such as the cone of complete shadow cast by an object.

19
Q

Comet

A

A body that produces a coma of gas and dust, a small icy body that orbits the Sun.

20
Q

Eclipse

A

An event during which one object in space casts a shadow onto another.

21
Q

Gibbous Moon

A

More than half but less than fully illuminated.

22
Q

Orbit

A

The path of an object in space as it moves around another object due to gravity.

23
Q

Heliocentric Theory

A

A Sun centered theory of the universe.

24
Q

Tide

A

The rise and fall of oceans caused by the gravitational pull of the moon and sun.

25
Q

Waning

A

The gradual decrease in the illuminated surface of the moon.

26
Q

Geocentric Theory

A

Earth centered theory of the solar system.

27
Q

Ellipse

A

An oval or flattened circle.

28
Q

Season

A

One of a pattern of temperature changes and other weather trends over the course of a year.

29
Q

Gravity

A

The force that objects exert on one another because of their mass.

30
Q

Impact crator

A

A round pit left behind on the surface of a planet after a smaller object strikes the surface.

31
Q

Solar System

A

The Sun and it’s family of orbiting planets and moons and other objects.

32
Q

Gas giant

A

A large planet that consists mostly of gases in a dense form.

33
Q

Full Moon

A

The entire surface of the moon is illuminated

34
Q

Satellite

A

An object that orbits a more massive object.

35
Q

Axis of Rotation

A

An imaginary line about which a turning body such as Earth rotates.

36
Q

Meteor

A

A brief streak of light produced by a particle entering Earths atomosphere at high speed.

37
Q

Asteroid

A

A small solid rocky body that orbits the Sun.

38
Q

Umbra

A

The dark central region of a shadow such as the cone of complete shadow cast by an object.

39
Q

Terrestrial planet

A

A planet that has a rocky surface.

40
Q

Equinox

A

In an orbit, a position and time in which sun shines equally on both hemispheres.

41
Q

Solstice

A

In a orbit, a position and time during one hemisphere receives the maximum sunlight.

42
Q

Waxing

A

The gradual increase of the illuminated surface of the moon.

43
Q

Quarter moon

A

Half the moon is illuminated