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astronaut image Astronaut
An astronaut is a person who travels, works, and lives in space.
aurora image Aurora
Auroras are colorful lights we see in the sky at night. The light from an aurora moves like a big, flowing curtain. We see most auroras near Earth's North Pole and South Pole.
corona image Corona
The corona is the Sun's atmosphere. We see the corona during a total solar eclipse.
Coronal Mass Ejections  image Coronal Mass Ejections
Coronal mass ejections are big eruptions coming off the Sun.
Convection Zone image Convection Zone
The convection zone is the part of the Sun where hot gases bubble like boiling water.
Cycle image Cycle
A cycle is something that happens over and over again-like day and night. A cycle is a pattern that repeats.
magnetosphere image Magnetosphere
The magnetosphere is an invisible shield around Earth. The magnetosphere protects us from the solar wind.
photosphere image Photosphere
The photosphere is the part of the Sun that we can see with a solar telescope. Remember, NEVER look directly at the Sun. You can hurt your eyes!
satellite image Satellite
A satellite is an object that orbits Earth or another body in space.
solar maximum image Solar Maximum
Solar maximum is when the Sun is very active.
solar minimum image Solar Minimum
Solar minimum is when the Sun is not very active.
solar wind image Solar Wind
The solar wind always flows from the Sun.
star image Star
A star makes energy. A star gives off light and heat.
sunspot image Sunspot
A sunspot is a spot on the Sun that is darker and cooler than the rest of the Sun.
venus image Venus
Venus is a planet. Venus is very hot. Sometimes you can see Venus after sunset or before sunrise.
venus transit image Venus Transit
June 8th, 2004 is a special day! Venus will be between us on Earth and the Sun. With special telescopes we will see Venus move in front of the Sun.

Many of the above definitions were provided by the following websites:

From Stargazers to Starships: Author and curator: David P. Stern

Imagine the Universe! : Project Leader: Dr. Jim Lochner

Responsible NASA Official: Dr. James Thiemann
Web Manager/Curator: Troy Cline
Web Designer/Curator: Lori Ann Persichitti Lopez
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