Explains what comets are, how they are formed, and how their unusual orbits bring them into earth's view at predictable intervals, with a special focus on Halley's comet
Editions · 5
Paperback
1985 · Trophy Pr
EN
9780064450881
Paperback
1985 · HarperCollins Publishers
EN
9780064450171
Paperback
1985 · HarperCollins Publishers
EN
9780064450171
Paperback
1987 · HarperCollins
32 pp · EN
9780690044157
Hardback
1987 · Harpercollins Childrens Books
EN
9781559942430
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