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Article of the Month: February 2015
The heavyweight champion of the Cosmos!
Dark energy may be driving most galaxy clusters apart from one another. But on occasion, huge galaxy clusters can merge, forming the largest gravitationally bound structures in the universe. The largest such cluster ever discovered is the El Gordo galaxy cluster. Learn more about it in this month's column!
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Play and learn
Simple and fun learning activities to share with children.
Clues from Ancient Light—With the GALEX space telescope, astronomers know the age of a source's light by its degree of red shift. In this learning-by-analogy activity, kids arrange pictures of familiar objects by judging which is older.
Paint by Pixels—Make a picture using a technique similar to that used by many NASA spacecraft to record and send pictures back to Earth.