Astronomers
The Sun
Planets I
Planets II
Comets Asteroids Meteors
100
Copernicus' idea that the Earth and planets revolve around the sun
What is a heliocentric system?
100
A middle, reddish layer of the sun's atmosphere
What is the chromosphere?
100
The brightest planet in the sky
What is Venus?
100
The planet that has an extremely thin atmosphere and the greatest range of temperatures in the solar system
What is Mercury?
100
A meteoroid that has entered Earth's atmosphere, producing a streak of light
What is a meteor?
200
Scientist who concluded that inertia and gravity keep the planets in orbit
Who is Isaac Newton?
200
The process by which hydrogen and helium join together to create energy
What is nuclear fusion?
200
The blue planet with extremely strong winds
What is Neptune?
200
The dwarf planet that takes 248 Earth years to revolve around the sun
What is Pluto?
200
The region of the solar system between the orbits of Mars and Jupiter that contains many small objects
What is the asteroid belt?
300
Scientist who discovered that the orbit of each planet is an elongated circle
Who is Johannes Kepler?
300
A stream of electrically charged particles that is sent out by the corona
What is the solar wind?
300
Saturn's largest moon
What is Titan?
300
The gas giant that appears to have been knocked on its side
What is Uranus?
300
The two parts of a comet's head
What are the nucleus and the coma?
400
The shape of a planet's orbit
What is an ellipse?
400
Explosions of hydrogen gas on the sun
What are solar flares?
400
The two gases that make up most of Jupiter's atmosphere
What are hydrogen and helium?
400
The gas that absorbs red light and reflects blue light, making two gas giants appear blue
What is methane?
400
An event that happens several times a year that makes it possible to wish upon a "shooting star"
What is a meteor shower?
500
The Greek word meaning "wandering star"
What is a planet?
500
The approximate temperature of the sun's core
What is 15 million degrees celsius
500
Mars' largest moon
What is Phobos?
500
The name of the mission sending people to Mars in 2024
What is Mars One?
500
The name of the comet that your teacher watched outside when she was little (in 1997)
What is Comet Hale-Bopp?
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