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Wikipedia definition
1. Hubble Deep FieldThe Hubble Deep Field (HDF) is an image of a small region in the constellation Ursa Major, constructed from a series of observations by the Hubble Space Telescope. It covers an area 2.5 arcminutes across, about one 24-millionth of the whole sky, which is equivalent in angular size to a 65 mm tennis ball at a distance of 100 metres.
Read “Hubble Deep Field” on English Wikipedia
Read “ハッブル・ディープ・フィールド” on Japanese Wikipedia
Read “Hubble Deep Field” on DBpedia

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