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52 Cards in this Set

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  • Back
The model of the universe where the Earth is the center is called a ________ model
Geocentric
The path that a planet takes around the sun is called its.......
Orbit
The laws of gravity and motion were created by .....
Newton
He discovered that the planet's orbits were elliptical.
Kepler
Which of the inner planets has retrograde rotation compared to the other inner planets?
Venus
What astronomer was the first to map the moon's surface; he also saw the moon's of Jupiter.
Galileo
Which of the planets is closest to the sun in its orbit?
Mercury
The atmosphere of Mars is made mostly of what gas?
Carbon dioxide
Which of the inner planets is called Earth's twin?
Venus
The Heliocentric model of the universe was developed by.....
Copernicus
Which inner planet is covered with such a dense cloud layer that its surface is not visible?
Venus
What is the shape of the planets' orbits?
Ellipses
These people could predict eclipses of the moon and marked its phases thousands of years ago.
Mesopotamians
The study of the stars and planets and how they affect the lives of people is called.....
Astrology
According to Ptolemy, the center of the universe was the .....
Earth
The tail of a comet is made of ions and .....
dust
Mercury is very hot during its daytime because of ....
its closeness to the sun
Which two planets have an atmosphere that is over 90% carbon dioxide?
Venus and Mars
What do you call a meteor before it enters the Earth's atmosphere?
meteoroid
What is the name of the force that holds all the solar systems members in orbit around the sun?
gravity
What do we call an orbit around the sun that is very elliptical?
eccentric
What is the "great red spot?"
A storm on the surface of Jupiter
How was information about the outer planet sent back to Earth?
Voyager
The methane in Uranus' atmosphere causes it to be what color?
Blue-green
Why is Mars called the red planet?
Its soil has a lot of the mineral iron oxide
what are Saturn's rings made from?
particles of dust and chunks of rocks and ice
What do scientists hope to learn by studying the composition of meteorites?
the early history of the solar system
Which planets are considered "twins"
Earth/Venus
This astronomer was the first to use a telescope to map the surface of the moon.
Galileo
What are the two main gases of the outer planets?
hydrogen and helium
What do we call the area of the solar system where comets are made?
Oort cloud
Which planet has such a low density that it will float in water?
Saturn
Which planet is tipped on its axis over 90 degrees?
Uranus
Which planet's day is longer than its year?
Venus
which planet's Latin name is Terra Firma?
Earth
This planet has the largest ring system.
Saturn
This planet is called the red planet.
Mars
This planet has a very eccentric orbit so that for several years it was the 8th planet from the sun instead of the 9th.
Pluto
The large gas planets are given the name...
Jovian
The smaller inner planets are given this name because of what they are made.
Terrestrial
What does the term "retrograde" mean?
backwards
The only planet to show any signs of life is.....
Earth
Asteroids are located between what two planets?
Mars and Jupiter
What makes up a comet?
large chunk of ice, dust, frozen gases, and rock fragments
What is a meteorite?
a meteor that hits the Earth's surface
How many tails does a comet have?
two
From what are the two tail of a comet made?
one is made from dust

one is made from ions
Which two inner planets have an atmosphere that allows for a greenhouse effect?
Earth and Venus
He measured the circumference of the earth by angles and shadows over 2000 years ago.
Eratosthenes
The turning of a planet on its axis which causes day and night is called.....
Rotation
Which astronomer developed the heliocentric model of the universe?
Copernicus
what is the source of the light that we see from the planets?
reflected light from our sun