Solar Seystem Flashcards

1
Q

Orbit

A

repeating path that one object in space takes around another one

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2
Q

Crescent moon

A

a curved shape that is wider in the middle than at its ends

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3
Q

Revolution

A

a complete, 360-degree turn or rotation

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4
Q

Gravity

A

A body that attracts other ones

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5
Q

Wanning

A

Unnaturally pale

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6
Q

Meteor

A

A streak of light

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7
Q

Quarter moon

A

The moon is a quarter lit

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8
Q

Comet

A

a celestial object consisting of a nucleus of ice and dust

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9
Q

Galaxy

A

a huge collection of gas, dust, and billions of stars and their solar systems, all held together by gravity

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10
Q

Season

A

a single, dominant repeating pattern of fixed frequency

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11
Q

Heliocentric

A

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

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12
Q

terrestrial planet

A

Earth-like planets made up of rocks or metals with a hard surface

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13
Q

Meteor

A

a small body of matter from outer space that enters the earth’s atmosphere, becoming incandescent as a result of friction and appearing as a streak of light

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14
Q

Equinox

A

the time or date (twice each year) at which the sun crosses the celestial equator, when day and night are of approximately equal length

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15
Q

Geocentric

A

having or representing the earth as the center, as in former astronomical systems

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16
Q

Astronomical Unit

A

a unit of measurement equal to 149.6 million kilometers, the mean distance from the center of the earth to the center of the sun

17
Q

Full Moon

A

an object that orbits a planet or another celestial body that is not a star

18
Q

Eclipse

A

occurs when one heavenly body such as a moon or planet moves into the shadow of another heavenly body

19
Q

Tide

A

very long-period waves that move through the ocean in response to the forces exerted by the moon and sun

20
Q

Asteroid

A

a small rocky body orbiting the sun. Large numbers of these, ranging in size from nearly 600 miles

21
Q

Waxing

A

increasing, or becoming larger in size

22
Q

Quarter Moon

A

When half of the Moon’s disc is illuminated

23
Q

Umbra

A

that part of a shadow in which all light from a given source is excluded

24
Q

Penumbra

A

space of partial illumination (as in an eclipse) between the perfect shadow on all sides and the full light

25
Solstice
the time or date (twice each year) at which the sun reaches its maximum or minimum declination, marked by the longest and shortest days
26
New Moon
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
27
Meteorite
a streak of light in the sky caused by a meteoroid crashing through Earth's atmosphere
28
Impact Crater
a crater on a planet or moon caused by the impact of a meteorite or other object, typically circular with a raised rim
29
Satellite
an artificial body placed in orbit around the earth or moon or another planet in order to collect information or for communication
30
Gibbous Moon
Waxing Gibbous: The waxing gibbous phase is between a half moon and full moon
31
Crescent Moon
the shape of a moon that is less than half-illuminated
32
Mare
the female of a horse or other equine animal
33
Universe
all existing matter and space considered as a whole; the cosmos. The universe is believed to be at least 10 billion light years in diameter and contains a vast number of galaxies
34
Orbit
the curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution