| A | B |
|---|
| Kepler | Credited with describing the orbits of the planets as elliptical |
| Copernicus | Proposed that the Sun is the center of the universe (HELIOCENTRIC) |
| Aristotle | Proposed that the Earth is the center on the Solar System (GEOCENTRIC) |
| meteorite | a rock that strikes the Earth |
| Satellite | a body that revolves around a planet |
| Geocentric | A model of the Solar System with the Earth at the center |
| Heliocentric | a model of the Solar System with the Sun at the center |
| Astronomy | Science of the stars |
| Astrology | Belief that birth and the arrangement of stars dictates life |
| Nebulla | A large cloud of dust and gas in interstellar space; a region in space where stars are born and explode at the end of their lives |
| Oort Cloud | Where comets are born |
| Gas Planets | The outer four planets of the Solar System known for their rings and satellites |
| Asteroid Belt | Separates the inner and outer planets |
| Rotation | the time it takes for a planet to spin on its axis (day) |
| Revolution | Orbital movement of planets around the sun (year) |
| Accretion | The process responsible for the forming of planets by collision of particles making other particles bigger and larger particles having more gravity so they pull more particle toward them to cause more collisions. |
| Moon | Responsible for the Earth's tides |
| Outside Neptune | Location of the Kuiper Belt |
| Gravity | Holds the Solar System together |
| 4.6 Billion | Age of the Solar System |
| sun | Center of the Solar System |
| From Earth | Origin of Earth's moon |
| Sun - Earth - Moon | Order of allignment necessary for a lunar ecclipse |
| Sun - Moon - Earth | Order of allignment neccessary for a solar ecclipse |
| Sun's Gravity | The force that keeps Earth from flying off into outer space |
| Earth | Planet in our Solar System with sustainable life |
| Venus | Planet in Solar System with Extreme Greenhouse Effect; Brightest object in the night sky other than the moon; similar in size to Earth; Sister planet |
| Mars | Red Planet; 2 moons; Rotation closest to Earth (24 hours) |
| Jupiter | Great Red Spot (400 year old giant storm); Gallilean moons (Io, Europa, Ganymeade, and Calisto); most moons; shortest rotation |
| Saturn | Most visible ring system |
| Uranus | Rotates on its side (98 degrees) |
| Mercury | Closest to the sun |
| Neptune | Blue; Longest Revolution |
