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Astronomy
Midterm note cards
7
Astronomy
Undergraduate 1
10/16/2012
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Term
Light Year
 Definition
Unit in distance in which light travels in a year
Term

(AU) 

Astronomical Unit

 Definition
the average distance from the Sun to the Earth
Term
Planet
 Definition

- a celestial body

- in orbit around the Sun

- has a great mass for its self-gravity to overcome rigid body forces (to make round shape)

- cleared the neightborhood around orbit
Term
Dwarf Planet
 Definition

- celestial body

- in orbit around the sun

- has not cleared the neighborhood around orbit

- not a satellite
Term
Order of Solar System (from the Sun)
 Definition
Sun - Mercury - Venus - Earth - Asteroids - Mars - Jupiter - Saturn - Uranus - Neptune - Transneptunian Objects - Kuiper Belt - Pluto - Oort Cloud
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