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Cubangbang #170735

Cubangbang 8th Chapter 5 Stack #170735

planets greeks called wanderers
perihelion when a planet is closest to the sun
aphelion when a planet is farthest from the sun
astronomical unit/ ua the earth's average distance from the sun
albedo indicates a planets reflective ability
mass a measure of the amount of matter the planet contains
inferior planets the planets whose orbits are between the earths orbit and the sun
phases the amount and shape of the planet's illuminated surface that is visible from the earth
transits when a planet passes directly between the earth and the sun so that we see its dark silhouette against the sun's bright disk
superior planets planets that are further from the sun than the earth's orbit,move slower than the earth
retrograde motion when the earth passes a superior planet and the planet appears to move backwards compared to the backward stars
terrestrial planets planets that are the earths size or smaller have have about the same density as the earth
jovian also called Jupiterlike stars
gas giants planets that are mostly gaseous
phobos and deimos Mars' two moons named after the attendants of the Greek god of war
galilean moons moons that Galileo discovered
great red spot a feature on jupiter that is a reddish-colored, rotating, oval shaped area that astronomers have been trying to explain for centuries
ganymede a galilean moon that is larger than Mercury and Pluto
Cassini's Division a group of rings that surround Saturn that appears to be completely empty from earth
Uranus discovered in 1781 by William Herschel
Urbain Jean Joseph Leverrier and John Couch Adams two mathematicians that made independent calcuations about where a new planet would have to be to affect Uranus's orbit
Johann Gottfried Galle found a new planet in 1846 less than 1˚ from the position that Leverrier had calculated
Percival Lowell a wealthy american businessman and astronomer that built his own observatory in order to search for a unknown planet and calculated where another planet should be and got pictures of "planet X"
Clyde Tombaugh found the exclusive "planet X"
Pluto earlier called planet X
surface gravity the downward pull the plane exerts on objects at its surface
Created by: bmichaud