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35 Cards in this Set

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How was the system formed?
1.started as a cloud of nebula
2.gravity contracted it
3. prressure got high
4.started to burn
5. rest of material was pushed away and turned into planets
What are the gas planets?
Jupiter, Saturn, Uranus, Neptune
What are the rock planets?
Mercury, Venus, Earth, Mars
What is the length of earth's year/day
year: 365.24
day: 23.56 minutes
How far is earth away from the sun?
150 million km
Which planets have rings?
Neptune, Uranus, Saturen, Jupiter
Which planets have 2 or more moons?
Neptune, Uranus, Saturn and Jupiter
Which planet has the widest range in temperature?
Mercury--no atmosphere
Which is the hottest planet in the solar system?
Venus--its atmosphere acts as a blanket, trapping the heat in--second closest to the sun
What are the three reasons NASA is so interested in Mars?
--Found fossilized bacteria
--The atmosphere is similar to ours
--Evidence of water and polar ice caps
What is unique about Venus' rotation?
Rotates opposite every planet (clockwise)
What is unique about Uranus' rotation?
Uranus rotates on its side (vertical)
What planet was first discovered by telescope?
Uranus
What planet was discovered by a mathematical formula?
Neptune
What is unique about the orbit of Neptune and Pluto?
Somtimes Pluto is closer to the sun then Neptune
Pluto is located in what region of space?
Kuiper Belt
How does the size of the planet affect the lenght of its day?
The bigger the planet--the smaller the day (vice versa)
List the planets form largest to smallest?
Jupiter
Saturn
Uranus
Neptune
Earth
Venus
Mars
Mercury
Pluto
What is the geocentric model of the universe?who purposed it?
Geocentric: earth is the center of the solar sytem
--Ptolemy
Explain the view that Copernicus developed. What is this model called?
Heliocentric: sun is the center of the earth and the earth and moon revolve around the sun, the daily movement of the sun and stars is caused by the rotation of the earth
What are the different objects that are located within our solar system?
9 planets, sun, stars, moons, etc
Inner planets
Mercury, Venus, Earth, Mars
Outer planets
Jupiter, Saturn, Uranus, Neptune, Pluto
List 3 differences between the inner and outer planets
Inner planets made of heavy elements--Outer planets made of light gasses
Inner planets-made of these heavy elements and sun couldnt push them away--Outer planets made of light gasses so sun pushed it away
What two forces keep the planets in motion around the sun?
**Gravity and Inertia keeps the planets in orbit
**Gravity from sun keeps the planets in orbit--if gravity was cut off it would go in a straight line
**Inertia keeps planets from being drawn into sun--if inertia were cut off, the planets would drop
What are the four discoveries that Kepler made about planetary motion?
--Closer planets travel faster around the sun than further planets
--Further away-less gravity-slower
--Aphelion--a point of orbit farthest from the sun
--Perihelion--a point of orbit closest to the sun
What is an asteroid? Where are most asteroids in the solar system located?
**A piece of rock similar to but smaller than a planet orbiriting the sun.
**Asteroid Belt--between Mars and Jupiter
What is a comet? What are its three main parts?
**A mass of rock and dust mixed with frozen water, methane and gas.
**Nucleus, Coma and tail
Which directoin does the tail of the comet point?
Opposite of the sun bcuz solar wind pushes it away
Does a comet always have a tail?
No because when it is not by the sun there is no tail.
What is a meteoroid?
a piece of rock that floats in space
What is a meteor?
a piece of rock that enter the earth's atmosphere
What is a meteorite?
a meteorite is a meteor that does not completely burn and strikes a planet
Where do most meteoroids come from? What causes a meteor shower?
**They come from parts of comets
**When a planet goes through a comet tail
What are the two main differences between meteoroids and astroids.
Asteroids are bigger and orbit the sun