Science Flashcards

1
Q

Solar system

A

The sun and its family of orbiting planets moons and other objects

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2
Q

Galaxy

A

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

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3
Q

Universe

A

Space and all the matter and energy in it.

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4
Q

Satellite

A

An object that orbits a more massive object

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5
Q

Impact crater

A

A round pit left behind on the surface of a planet or other body in space after a smaller object strikes the surface.

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6
Q

Axis of rotation

A

An imaginary line about which a turning body such as earth rotations

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7
Q

Revolution

A

The motion of one body around another such as earth in its orbit around the sun

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8
Q

Season

A

One part of a pattern of one temperature changes and another whether trends over the course of a year

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9
Q

Equinox

A

In an orbit a position and time in which sunlight shines equally on the northern hemisphere and the Southern Hemisphere

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10
Q

Solstice

A

In an orbit a position and time during which one hemisphere gets its maximum area of sunlight

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11
Q

Mare

A

A large dark plain of solidified lava on the moon

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12
Q

Eclipse

A

An oval or flattened surface.

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13
Q

Umbra

A

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

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14
Q

Penumbra

A

A region of lighter shadow that may surround an umbra

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15
Q

Astronomical unit UA

A

Earths average distance from the sun which is approximately 150 million kilometers

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16
Q

Ellipse

A

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

17
Q

Terrestrial planet

A

Earth or planet similar to earth that has a rocky surface

18
Q

Gas giant

A

A large planet that consist mostly of gases in a dense form

19
Q

Asteroid

A

A small solid rock body that orbits the sun

20
Q

Comet

A

A body that produces a coma of gas and dust

21
Q

Meteor

A

A brief streak of light produced by a small partial entering earths atmosphere

22
Q

Orbit

A

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