Your Vacation in Space

atmosphere

the layer of gases surrounding Earth or other planets

Harmful gases from factories pollute Earth’s atmosphere every day.

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gravity

the natural force that pulls things toward each other

My science teacher said that without gravity, everything would float around!

photo credit: Zastolskiy Victor/Shutterstovk

technology

something created by science to solve problems

Air bags in cars are one example of how technology can help save lives.

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spacecraft

vehicles for space travel

A number of spacecraft have landed on Mars now, but Viking 1 was one of the first.

photo credit: JPL/NASA

orbit

a curved path around Earth

The moon is in constant orbit around Earth.

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