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Science > Astronomy > Flashcards

Astronomy Flashcards

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1
Q

What is a nebula?

A

A nebula is a cloud of gas and dust probably cast off from other stars that used to live in this region of our galaxy.

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2
Q

How much does one parsec equal ?

A

3.62 light years

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3
Q

What is an Astronomical unit ?

A

The average distance between sun and Earth

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4
Q

What is a light year ?

A

The distance light goes in one year

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5
Q

What does planetesimal mean ?

A

A minute planet; a planet that did or could coe together with many others under gravitation to form a planet.

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6
Q

What is a terrestrial planet ?

A

A planet having a compact rocky surface like the Earth’s; the four most innermost planets in the solar system.

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7
Q

What is an orbit ?

A

The curved path of a celestial object or spacecraft around a star, planet, or moon.

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8
Q

What is the process called that releases energy when lightweight nucleai combine to form heavier nuclei?

A

Nuclear fusion

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9
Q

What is the grouping of stars in the night sky that are in a recognizable pattern ?

A

Constellation

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10
Q

What is another name for the outer solar system planets ?

A

Gas Giant Planets

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11
Q

What are the outer solar system planets?

A

Jupiter, Saturn, Uranus, and Neptune.

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12
Q

What are the Terrestrial Planets ?

A

Mercury, Venus, Earth or Mars.

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13
Q

What do the Terrestial Planets mainly consist of ?

A

Rocky material

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14
Q

What does a comet consist of ?

A

A nucleas, ice and dust.

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15
Q

What does it mean to revolve ?

A

Move in a circular orbit around

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16
Q

What is an asteroid ?

A

A small rocky body orbiting the sun.

17
Q

What is the job title of an astronomer who studies the evolution and space-time relations of the universe ?

A

A cosmologist

18
Q

What does protoplanterary mean ?

A

Protoplanterary are moon sized or larger planetary embryos within protoplanterary disc that have undergone internal melting to produce differentiated interior..

19
Q

How long is a Solar Day ?

A

The time between successive meridian transits of the sun at a particular place.

20
Q

What is a rotation ?

A

The action of rotating around an axis or center.

21
Q

What is angular velocity ?

A

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

22
Q

How long is a sideral day ?

A

Equal to 23 hours 56 minutes and 4 seconds in units of mean solar time.

23
Q

What is a year ?

A

A period of time duing which the earth completes a single revolution around the sun.

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