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Astronomy Flashcards

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1
Q

What is the Definition of Astronomical Unit?

A

Average difference between the sun and the earth.

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2
Q

What is the Definition of Light Year?

A

The distance light travels in one year.

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3
Q

What is the Definition of Parsec?

A

Unit to descibe large distances.

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4
Q

What is the definition of Nebula?

A

Light or dark patch in the sky; a cloud of gas or dust.

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5
Q

What is the Definition of constellation?

A

Group of stars in recognizable pattern during night.

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6
Q

What is the Definition of Planetesimal?

A

A widely selected theory of the planet fomation.

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7
Q

What is the Definition of Nuclear Fusion?

A

A nuclear reaction in which the nuclei combineds to form a larger nuclei and release energy.

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8
Q

What is the Defintion of Protoplanetary?

A

Clump of material formed in the early stages of solar system formation.

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9
Q

What is the Definition of Terrestrial planets?

A

Planets made mostly of rocks and is similar in density and size.

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10
Q

What is the Definition of Gas Giant Planets?

A

Planets composed of mostly hydrogen, helium and methan.

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11
Q

The Definition of Comet is?

A

Chunk of frozen ice and debris that orbits the sun.

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12
Q

The definition of Asteroid is?

A

A medium sized rock that is smaller than a planet, but larger than a meteoroid. And it orbits the sun.

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13
Q

The definition of Cosmologist is?

A

The astrophysical study of history, structure, and all of constituent dynamics of our universe.

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14
Q

The Definition of year is?

A

The time it takes the earth to orbit the sun.

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15
Q

The definition of solar day is?

A

The time between two passages of the sun.

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16
Q

The definition of side real day is?

A

The short interval between the passge of the sun, shorter than a solar day.

17
Q

The definition of rotation is?

A

The movement or path of the earth turning on its axis

18
Q

The definition of revolve is?

A

The earth orbiting at its central point.

19
Q

The definition of period is?

A

A round time or series measured in years.

20
Q

The definition of orbit is?

A

The ususal course of the earths rotation

21
Q

The definition of angular velocity is ?

A

The rate of change of angular displacement with respect to time.

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