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Science4 > Space Vocabulary Science Test > Flashcards

Space Vocabulary Science Test 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

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

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3
Q

Universe

A

Everything-space and all 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 crater on a planet or the moon made by a meteorite or other object

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6
Q

Axis of rotation

A

An imaginary line running through the earths center

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7
Q

Revolution

A

The motion of one object around another

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8
Q

Season

A

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

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9
Q

Equinox

A

Sunlight shines equally on the north and south hemispheres; when one half is lit the other is dark

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10
Q

Mare

A

The low-lying dark areas on the moon or other planets

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11
Q

Eclipse

A

The sun, moon, and earth line up exactly, a shadow crosses earth or the moon; in a lunar eclipse the moon darkens but in a solar eclipse the sun darkens

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12
Q

Orbit

A

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

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13
Q

Umbra

A

The darker shadow of earth

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14
Q

Penumbra

A

The lighter come shaped shadow of earth

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15
Q

Astronomical unit (AU)

A

About 150 kilometers; earth is about one AU from the sun

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16
Q

Ellipse

A

The shape of each orbit-a flattened circle or oval

17
Q

Terrestrial planet

A

Mercury, Venus, earth, and the sun, being the four closest planets to the sun

18
Q

Gas giant

A

Jupiter, Saturn, Uranus, and Neptune, being made mainly of hydrogen, helium, and other gases

19
Q

Asteroid

A

Small solid rocky bodies that orbit close to the sun

20
Q

Comet

A

An object that produces a coma

21
Q

Meteors

A

Particles in the air hot enough to glow producing brief streaks of light

22
Q

Meteorite

A

A space object that reaches earths surface

23
Q

Geocentric

A

Having or representing the earth as a center

24
Q

Heliocentric

A

Having or representing the sun as the center, as in the astronomical model of the solar system

25
Q

Gravity

A

The force objects exert on each other because of their mass

26
Q

Tide

A

The regular rise and fall of the surface level at oceans, lakes, or other bodies of water

27
Q

Waxing

A

The increasing of the illuminated area on the moon

28
Q

Waning

A

The decreasing of the illuminated area on the moon

29
Q

Gibbous moon

A

The moon when it is more than half full

30
Q

Crescent moon

A

The stage of the moon in its first or last stage

31
Q

Full moon

A

The stage of the moon when it is fully illuminated

32
Q

New moon

A

The stage of the moon when it is fully dark

33
Q

Quarter moon

A

When only a quarter of the moon is illuminated

Science4 (6 decks)

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