NGC 660 (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "NGC 660" in English language version.

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1spacetelescope.org

8,860^th place

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1web.archive.org

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1books.google.com

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books.google.com

Chen, James L.; Chen, Adam (2015-07-16). A Guide to Hubble Space Telescope Objects: Their Selection, Location, and Significance. Springer. p. 130. ISBN 978-3-319-18872-0.

caltech.edu

ned.ipac.caltech.edu

"NGC 0660". NASA/IPAC Extragalactic Database. Retrieved 20 January 2015.

nasa.gov

apod.nasa.gov

Nemiroff, R.; Bonnell, J., eds. (8 November 2014). "Polar Ring Galaxy NGC 660". Astronomy Picture of the Day. NASA. Retrieved 2015-01-20.

noao.edu

"NGC 660". National Optical Astronomy Observatory. Archived from the original on 2015-01-21. Retrieved 2015-01-20.

science20.com

"NGC 660 And A Rare Polar-Ring Galaxy". Science 2.0. 18 October 2012. Retrieved 2015-01-20.

spacetelescope.org

Hubble Space Telescope. "A bizarre cosmic rarity: NGC 660". ESA & NASA. ESA. Retrieved 2015-01-20.

u-strasbg.fr

simbad.u-strasbg.fr

"NGC 660". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 20 January 2015.

web.archive.org

"NGC 660". National Optical Astronomy Observatory. Archived from the original on 2015-01-21. Retrieved 2015-01-20.