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26 Cards in this Set

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  • Back
Who is Ptolemy and what was his views on the solar system?
Geocentric- earth is center of solar system
includes earth moon sun and 5 planets (mercury,venus,mar, juipiter, staurn)
all revolve around the earth.
What are Copernicus's view of the solar system?
Heliocentric- sun is the center of the solar system
moon revolves around the earth; earth and moon together revovle around sun
Name the nine planets and what else is in our solar system?
Sun, Mercury, Venus, Earth, MArs, Jupiter, Saturn, Uranus, Neptune, Pluto.
How did the solar system form?
- 4.6 billion years ago solar system was a vast swirling cloud of gas, ice, and dust called a nebulae

- Gravity started contracting particles into a large tightly packed spinning disk
Matter condensed in the center attracting 99% of all mater in solar system
Center so hot (10 million degrees C) nuclear fusion begins and the sun was born.

- Rest of material cooled and clumped into scattered solids

- Clumps collided and combined to form the planets: Inner planets- made of heavy elements- sun couldn’t push them away. Outer planter- made of light gasses that got pushed away from sun.
What keeps the planets in orbit?
gravity and inertia
gravity keeps sun
inertia keeps planets
what are keplers laws of planetary motion
1. Ellipitical orbits- not circular
2.Sun not centerd in the orbit
no question
Closer planets travel faster around the sun than farther planets
- Inner planets- smaller orbit and faster speed.
- Outer planets- larger orbit and slower speed.
what is a meteoriod?
a chunk of rock (not as big as asteroids) floating around in space.
What is a meteors?
“shooting stars”- a meteoroid that enters the earth’s atmosphere.
what is a meteorite
a meteor that does not completely burn and strikes a planet.
what is an asteriod?
a piece of rock similar to but smaller than a planet orbiting the sun. Larger than a meteoroid. Meteors do not orbit the sun
- Usually found in the asteroid belt between Mars and Jupiter
- Pieces of a planet that never formed?
- Irregular shapes- not round
- Largest is Ceres (620-mi)
- A mass of rock and dust mixed with frozen water, methane and ammonia “dirty snowball”
structure of a comet?
Head, Nucleus, Coma, Tail
are formed by solr wind
name from largest to smallest the rankings of the planets
Jupiter- 1st
Saturn- 2nd
Neptune- 4th
Earth- 5th
Venus- 6th
Mars- 7th
Mercury- 8th
name the planet first discovered by tele.
name the planet discorved by math
which planets have rings?
Jupiter Saturn Uranus Neptune
Mercurys atmospere
has no atmoshpere
where is the asteriod belt located?
between JUpiter and mars
Which direction does the tail of the comet point? Why?
The tail always points away from the sun. This happens because of the solar wind.
Does a comet always have a tail? Explain.
No because if the comets are far from the sun the comet isn’t melting.
metoeriods come from passing comets
why does the year get llonger when u get farther away from the sun?
b/c it takes longer ot orbit the sun
whic planets have moons?
Earth (1), Mars (2), Jupiter (61), Saturn(33), Uranus (27), Neptune (13), Pluto (1)