| A | B |
|---|
| Aristotle | Greek believed in Geocentric Solar System |
| Ptolemy | Greco-Egyptian believed in Geocentric Solar system |
| Copernicus | Polish believed in Heliocentric Solar System |
| Galileo | Italian provided proof of Heliocentric Solar System |
| Heliocentric | Sun-centered Solar system |
| Geocentric | Earth-centered Solar system |
| Rocket | missile or spacecraft propelled by rocket fuel in the atmosphere |
| Satellite | an object that orbits objects in space |
| Axis | line around which any body rotates |
| Axial tilt | the angle between an object's rotational axis and its orbital axis |
| Orbit | he gravitationally curved path of an object about a point in space |
| Revolution | the path the Earth takes as it travels around the Sun once |
| Rotation | the spinning of the Earth on its axis |
| Tides | the regular rise & fall of coastal water levels |
| gravity | the attractive force between two objects |
| Neap Tide | the low high tides that occur during the 1st & 3rd quarter moons when the forces of the moon & sun are perpendicular to one another |
| Spring Tide | the high low tides that occur during the full & new moons when the forces of the moon & sun are parallel to one another |
| Planet | large spherical bodies of matter that revolve around a star |
| Moon | bodies of matter that revolve around a planet |
| Mercury | 1st planet from the sun/smallest in size & mass |
| Venus | 2nd planet from the Sun/gaseous & hot |
| Earth | 3rd planet from the sun/covered large oceans & frozen ice caps at polar regions |
| Mars | 4th planet from the sun/reddish color with 2 moons |
| Space Probe | unmanned research spacecrafts |
| Astronomical Unit | the distance from the Earth to the Sun (150 million km) |
| Gas Giants | outer planets that are massive with thick atmospheres |
| Jupiter | 5th planet from the Sun/largest size & mass (67 moons) |
| Saturn | 6th planet from the Sun/2nd largest planet with rings |
| Uranus | 7th planet from the Sun/very cold with blue atomsphere |
| Neptune | 8th planet from the Sun/blue atmosphere (14 moons) |
| Dwarf Planet Pluto | small/rocky farthest from Sun |
| Sun | creates Energy from the nuclear fusion of hydrogen atoms into helium atoms |
| Asteroid | small rocky objects that revolve around the Sun |
| Comet | made up of ice & dust/orbit the Sun & planets in long narrow ellipses |
| Meteor | chunks of rock & dust that have entered the Earth's atmosphere |
| Solar System | the Sun, planets, moons, meteors, asteroids, & comets |
| Scale Model | a physical or mathmatical representation of an object or concept |
