Forms of water
Kinds of dirt
LIfe on Earth is protected by the atmosphere.
Life on Earth is protected by the carbon dioxide and other gasses.
Life on Earth is protected by the moon.
They were checking if water existed on the planet.
They were testing if the soil could be used to grow seeds.
They were watching for gases that would be released if organic molecules were present.
The Sojourner moved around on flexible tripods.
The Sojourner moved around on six wheels that were at the end of flexible legs.
The Sojourner moved around on 12 wheels that were at the end of sturdy legs.
They did not want to risk landing them on the edge of a cliff or the side of a volcano.
They were looking for evidence of water, and the plains showed some evidence.
They were testing the smoothness of the wheels, and the plains were more gentle.
Mars is missing it's own moon that would allow for day and night, like Earth.
Mars is missing the correct gravitational pull from the sun, that would make it a livable place.
Mars is missing the air and water that would make it a livable place.
An astronaut on Mars would need a spacesuit because the air is so thin.
An astronaut on Mars would need a spacesuit because the air is so thick.
An astronaut on Mars would need a spacesuit because the atmosphere is so thick.
Earth revolves around the sun and Mars does not.
Mars is a planet and Earth is not.
Earth has liquid water and Mars does not.
Teaches others about space
Drives a truck for a living
Studies rocks and earth
A small body that flew through space
A large boulder that is found on Mars
A colorful sunsest seen from space
Dust that can only be seen at night
Dust that is found in space
Dust that is found at the center of the planets
A fine red layer of red dust
A thin layer of ice
A protective layer of air