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astronomy Flashcards

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1
Q

What is the definition of angular velocity?

A

A change rate of an angle with a type on reference point.

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2
Q

What is the definition of parsec?

A

A unit that astronomers use to describe large distances.

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3
Q

What is the definition of constellation?

A

A grouping of stars in the night sky into a recognize pattern.

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4
Q

What is the definition of nebula?

A

A cloud of gas and dust.

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5
Q

What is the definition of light year?

A

A distance that light goes in 1 year.

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6
Q

What is the definition of astronomical unit?

A

An average distance between the earth and the sun.

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7
Q

What is the defintion of planetesimal?

A

A smal celestial body that is put together to form planets.

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8
Q

What is the defintion of protoplanetary?

A

A large unhatched offspring with protopalnetary discs and it is an internal melting to produce differnt interiors.

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9
Q

What is the defintion of nuclear fusion?

A

A nuclear fusion is when a nuclear reaction combine nuclei to form*** ***massive nuclei and to release energy.

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10
Q

Define terrestrial planets.

A

A planet that has a rocky surface similar to earth.

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11
Q

Define gas giant planets.

A

A plant that is cmposed to alomst entirely gas.

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12
Q

Fill in the blank.

comet is consisting of___ and _____.

A

NUCLEUS OF ICE AND DUST.

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13
Q

Define the word asteroid.

A

A small rocky body orbiting the sun.

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14
Q

Define the word cosmologist.

A

A astronomer that studies relations of the universe.

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15
Q

What is a period?

(scientific form)

A

A period is a portion of time.

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16
Q

Revolve moves in what directin on the central axis?

A

Circular direction.

17
Q

A rotation is the action of rotating around the axis. in what direction is it closes to earth?

a. same directin

b.opoosite direction

c. no where near the the earth.

A

a. same direction

18
Q

Describe sidereal day.

A

two consectuive transits

19
Q

Define solar day.

A

THE TIME BETWEEN TRANSITS OF THE SUN IN PARTICULAR PLACES.

20
Q

HOW MANY DAYS IS IN A YEAR AND DEFINE YEAR .

A

THERE ARE 365 DAYS IN A YEAR AND A YEAR IS A PERIOD OF TIME STARTING FROM THE FIRST MONTH OF JANUARY UNTIL DECEMBER WHICH IS THE LAST MONTH.

21
Q

Define parsec.

A

a unit of distance in astronomy.

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