23 terms

Solar System

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inner planets
planets that are small, rocky (terrestrial), and closer to the sun
outer planets
planets that are large, gaseous (Gas Gaints or Jovian), and farther from the sun
gravity
is the force that controls the motion of all objects in the Universe (mass and distance of objects determine strength of gravitational attraction)
asteroids
large pieces of space rock with irregulary shapes, most are found between the orbits of Mars and Jupiter
comets
are bodies made up of ice, dust, and small gritty particles. The Oort Cloud or Kuiper belt may be filled with billions or even trillion of these (sometimes referred to as "dirty snowballs"
meteoroids
are pieces of rock or dust in space that are smaller than asteroids (they can be made of rock, metal, or both)
asteroid belt
region of the solar system that is between the orbits of Mars and Jupiter where asteroids are plentiful
meteors
are meteroids that enter the Earth's atmosphere, burn up and produce streaks of light called _______________. (They are often refered to as shooting stars-this in a misnomer.)
meteorites
meteors that land on the Earth's surface are called________________.
solar system
includes the sun, planets, and many smaller objects
astronomical unit
the average distance from the Earth to the sun; approximately 150 million kilometers (symbol AU)
telescope
is an instrument that is used to observe the sky and space
light-year
the distance that light travels in 1 year; about 9.4 trillion kilometers
Mercury
-is the closest planet to the sun and the smallest
-planet is scorching during the day and freezing cold on the side that faces away from the sun. (has a rocky surface)
Venus
-is about the same as the Earth (has a rocky surface)
-has no water and is much hotter than Earth
-has the hottest temperatures in the Solar System
Earth
-is the only planet in the solar system that can support life
-is the only planet in the solar system 3/4 covered by liquid water
-has a rocky surface
Mars
-is called the "Red Planet" because of its red soil and rocks
-contains the largest volcano in the solar system
-has a rocky surface
Jupiter
-is the largest planet in the solar system
-gas gaint
-has a thin set of rings and at least 62 moons
-has a large red spot- huge storm
Saturn
-second largest planet in the solar system
-has super high winds
-has 62 moons
-has the largest system of rings in the solar system (gas gaint)
Uranus
-third largest planet in the solar sytem
-takes 84 years to orbit the sun
-the planet is axis is tipped- seems to rotate on its side
-has rings (gas gaint)
-known as an "ice gaint" ( blue-green color)
Neptune
-most distance planet in the solar system
-takes 165 years to orbit the sun
-gas gaint
-has rings and 13 moons
law of universal gravitation
the scientific law that states that every object in the universe attracts every other object
Interia
The tendency of an object to resist a change in motion-law that states that objects in motion have a tendency to remain in motion also plays a role in keeping the planets in orbit
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