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1) Black holes
Author
Series
Language
English
Description
Explains the nature and formation of the cosmic phenomenon known as a black hole.
2) Black holes
Author
Series
Language
English
Description
Presents facts about black holes, how they form and the different kinds.
4) Mars
Author
Series
Language
English
Description
Simple facts about the Red Planet such as its orbit, atmosphere, and terrain, as well as the outcomes of explorations such as the Pathfinder Mission.
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