Astronomy Flashcards

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1
Q
A
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2
Q

Astronomical Unit is ……

A

Average distance between sun and earth.

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3
Q

A Light Year is a………….

A

Distance light goes in one year

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4
Q

What is a Parsec

A

A unit used to describe large distances

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5
Q

Nebula is a…………….._ _

A

A cloud of interstellar gas and dust

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6
Q

What is a Constellation?

A

Any various groups of stars that have definite names

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7
Q

Planetesimal is the

A

small celestial bodies that were fused together to make the planets of the solar system

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8
Q

Protoplanetary

A

Moon sized or larger embryos within protoplanetary discs that have internal melting to produce differentiated interiors

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9
Q

Nuclear Fusion

A

A nuclear reaction in which atomic nuclei of low atomic number fuse to form a heavier nucleus with the realease of energy

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10
Q

Terrestrial Planets are………..

A

A plane composed mostly of silicate rocks or metal

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11
Q

Gas giant planets

A

Is a characterized by being mostly composed of gas

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12
Q

Comet_ _

A

a celestial body moving about the sun, consisting of a central mass surrounded by a envelope of dust and gas that mayform a tail that streams away from the sun.

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13
Q

Asteroid

A

A small rocky body orbiting the sun

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14
Q

Cosmologist

A

A physicist that specializes in the study of the formation and evolution of the universe

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15
Q

Angular Velocity

A

The time rate of change of angular position of a rotating body

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16
Q

Orbit

A

The curved path, usually elliptical described by a planet, satellite,etc, around a celestial body ,as the sun

17
Q

Period

A

How long an object takes to complete one cycle of revolution

18
Q

Revolve

A

To move in a circular or curving course of orbit

19
Q

Rotation

A

The movement or path of the earth or a heavenly body turning on its axis

20
Q

Sidereal

A

Determined by or from the stars

21
Q

Day

A

A division of time equalled to 24 hours

22
Q

Solar Day

A

A division of time equal to the tim elasped between two consectutive returns of the same terrestial meridian to the sun

23
Q

Year

A

A division of time equal to 12 lunar months