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Sun , Stars and Planets
Kingfisher Books
Larousse Plc, 1995
World Book Encyclopedia
World Book Encyclopedia
U.S.A, 1992 Volume 8
World Book Encyclopedia
World Book Encyclopedia
U.S.A, 1992 Volume 13
World Book Encyclopedia
World Book Encyclopedia
U.S.A, 1992 Volume 1
World Book Encyclopedia
World Book Encyclopedia
U.S.A, 1992 Volume 22
World Book Encyclopedia
World Book Encyclopedia
U.S.A, 1992 Volume 18
Young Scientist
1990, World Book Encyclopedia
Encarta 1998
The Internet
ASTRONOMY
1971, Experimental Edition
Photocopied Sheets
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