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Apollo Objects

They are asteroidlike bodies whose orbits cross the orbit of the earth. Some 30 of them are now known. They may be nuclei of comets that have lost their volatile components

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Scientific American Magazine Vol 240 Issue 3This article was originally published with the title “Apollo Objects” in Scientific American Magazine Vol. 240 No. 3 (), p. 54
doi:10.1038/scientificamerican0379-54