Space 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

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6
Q

Axis of rotation

A

An imaginary line about which a turning body

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7
Q

Revolution

A

The movement of one body around another

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8
Q

Season

A

One part of a pattern of temperature changes and another 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, while the other hemisphere gets its minimum amount

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

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13
Q

Umbra

A

The dark, central region of a shadow

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14
Q

Penumbra

A

The region of lighter shadow that may surround an umbra

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15
Q

Astronomical unit

A

Earth’s average distance from the sun

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16
Q

Ellipse

A

An oval or flattened circle

17
Q

Terrestrial planet

A

Earth or a planet similar to earth

18
Q

Gas giant

A

A large planet that consists 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 particle entering earth’s atmosphere

22
Q

Meteorite

A

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

23
Q

Geocentric

A

Having or representing as the center

24
Q

Heliocentric

A

Representing the sun as the center

25
Q

Gravity

A

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

26
Q

Tide

A

The alternate rising of the sea

27
Q

Waxing

A

The moon any time after new moon and before full moon

28
Q

Waning

A

The moon has a progressively smaller part of its visible surface illuminated, so that it appears to decrease in size

29
Q

Gibbous moon

A

The word crescent refers to the phases where the moon is less then half illuminated

30
Q

Crescent moon

A

Less then half illuminated

31
Q

Full moon

A

The phases of the moon in which its whole disk is illuminated

32
Q

New moon

A

The phases of the moon when it’s conjugating with the sun and visible from earth when it’s in conjugati

33
Q

Orbit

A

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