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M100_cepeid.jpg (350 × 300 بكسل، حجم الملف: 17 كيلوبايت، نوع الملف: image/jpeg)
Cepheids in Messier 100
From STScI [1] PD as seen here
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This file is in the public domain because it was created by NASA and the European Space Agency. Hubble material is copyright-free and may be freely used as in the public domain without fee, on the condition that NASA and ESA is credited as the source of the material. The material was created for NASA by STScI under Contract NAS5-26555 and for ESA by the Hubble European Space Agency Information Centre. [2] or [3]. |
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