Meteor, Comet, Asteoroid
The amount of time it takes for Halley's comet to orbit the Sun.
Every 76 years.
The idea that the planets, Sun, Moon, and stars rotated around the Earth.
Earth centered model
Largest planet in our solar system.
Jupiter
Mercury's temperatures range from very hot to very cold because of this.
There is no true atmosphere.
A comet's tail always faces this way.
Away from the Sun
A meteoroid that strikes Earth.
Meteorite
The idea that the moon revolves around the Earth and the planets revolves around the Sun.
Sun centered model
Planet that is similar to Earth in both size and mass.
Venus
This makes Uranus bluish-green in color.
Methane
Vaporized material forms a bright cloud called this.
Coma
This occurs when Earth's orbit passes through a group of meteoroids that enter the atmosphere.
Meteor Showers
Another name for the Earth-centered model.
Geocentric
Planet that has the lowest density in the solar system.
Saturn
Venus is the hottest planet in the solar system because of this.
Its dense carbon dioxide atmosphere creates a greenhouse effect.
Large group of comets surrounding solar system beyond Pluto.
Oort Cloud
A rock that is similar to that which formed planets.
Asteoroid
Another name for Sun-centered model
Heliocentric
Planet that has the largest volcano in the solar system.
Mars
Mars is called the Red Planet because of this.
Iron oxide in rocks makes them appear a reddish-yellow color
Io, Europa, Ganymede, Callisto
Dust and rock particles combined with frozen water, methane, and ammonia
Comet
This person had the idea that planets had elliptical orbits.
Kepler
The correct order of the planets from closest to the Sun to furthest.
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
Saturn's rings are composed of this.
Thousands of ringlets of ice and rock particles.
The N.E.A.R. probe indicated this.
Asteroid 433 Eros has been in many collisions over time.