1. Life Beyond Earth?
Solar System: consists of the Sun, planets, moons, asteroids, meteors, comets, dust, gases and primarily empty space.
Atmosphere: layer of air, made up of many layers and gases that surround the Earth’s surface keeping humans safe from the sun’s radiation.
Earth: (78% Nitrogen, 21% Oxygen, .9% Argon, .03% Carbon Dioxide)
Comet: chunk of ice and rock originating from the outer solar system

2. Life Beyond Earth?
Asteroid: rock in orbit, generally between Mars and Jupiter Meteoroid: space rock that is bigger than dust grain but smaller than asteroid. If it strikes Earth, it is a meteorite. Meteor: streak of light seen when a space rock enters the atmosphere and starts burning up; a falling star.

3. Life Beyond Earth?
Extraterrestrial Life: life that exists other than on earth
Satellite: is an object that revolves around another object in space.
natural satellite: any celestial body in space that orbits around a larger body. example: Moons 
artificial satellite: made by people and launched into orbit using rockets

4. Why is Earth the only planet in our solar system that supports life?
“Goldilocks” Conditions
Earth has liquid water (just right H2O)
Suitable temperature (just right temperature)
Atmosphere for living things (just right atmosphere)

5. Why are other planets in our solar system unable to support life as we know it based on their characteristics?

6. The Moon’s Surface
Maria: dark, flat areas on the moon’s surface. Actually, hardened rock form by lava.
Galileo thought they were seas.

7. The Moon’s Surface
Craters: large round pits on the moon’s surface caused by impacts of meteoroids; crater walls shield some areas from sunlight

8. The Moon’s Surface
Highlands: the light colored features which look like mountains and cover much of the moon’s surface

9. Characteristics of the Moon
Atmosphere: dry and airless Size: 3,476 km in diameter; about ¼ of the Earth’s diameter; compared to the Earth, moon is small. Temperature: range from a torrid 130 degree C in direct sunlight to a frigid -180 degree C at night. Water: no liquid water; large patches of ice near the poles are evident

10. The Origin of the Moon

11. The Origin of the Moon
Scientists think that a planet-sized object collided with Earth to form the moon. Material from the object and Earth’s outer layers was ejected into orbit around Earth, where it formed a ring. Gravity caused this material to combine to form the moon.

12. NASA scientists say we could colonize the Moon by 2022
NASA scientists say we could colonize the Moon by for just $10 billion.

13. Mars One is an organization based in the Netherlands that has proposed to land the first humans on Mars and establish a permanent human colony there by 2026.