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Letter I

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NASA’s Picture Dictionary

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Impact Crater
International Space Station
Invention

Impact Crater

A hole made when a rock from space hits a planet or moon.

A crater on Earth's moon
The crew members of Apollo 11 photographed this large crater as they circled the moon in 1969.
NASA

Sentences:
The largest impact crater NASA has discovered in the solar system was found on Mars.
The first impact crater recognized on Earth is in Arizona.

Related Links:
A Crater on Earth

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International Space Station

A laboratory that orbits Earth, where people live and work.

The International Space Station in space with Earth in the background
The International Space Station is shown in an image taken by an astronaut flying in a space shuttle.
NASA

Sentences:
Construction of the International Space Station began in 1998.
The International Space Station orbits Earth once every 90 minutes.

Relative Link:
What Is the International Space Station? (Grades K-4)
What Is the International Space Station? (Grades 5-8)
Now in Space

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Invention

Something made for the first time; creation of something new.

Robonaut 2 (R2) and a woman sitting at a computer nearby
Robonaut 2 is an invention that helps do work on the space station.
NASA

Sentences:
When a NASA invention is used in a new way, it is called a “spinoff.”
The invention of the elevator allowed buildings to be much taller.

Related Links:
NASA Home and City

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