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	Messier Object 101
		Messier 101 (M101, NGC 5457) was discovered by Pierre Méchain on March 27, 1781, and added as one of the last entries in Charles Messier's catalog.
		M101 is the brightest of a group of at least 9 galaxies, called the M101 Group.
		Three supernovae have been discovered in M101: The first one, SN 1909A, appeared on January 26, 1909 and was discovered by Max Wolf; it was of peculiar type and reached mag 12.1 (Glyn Jones reports that the discovery took place in February, and the SN reached only mag 13.5).
	www.seds.org /messier/m/m101.html (569 words)

	Spiral Galaxy M101 (Site not responding. Last check: 2007-10-27)
		It dominates a small group of galaxies, with some of its neighbors such as NGC 5474 showing wear and tear attributed to the tidal effects of M101.
		M101 itself is further noteworthy for its extensive and lopsided distribution of neutral hydrogen gas, and for showing evidence of gas falling into its disk at high speeds.
		Cepheid variables suggest a distance of about 7 Megaparsecs (about 22 million light-years); at that distance some can just be picked up from the ground when the seeing cooperates, though the definitive study had to await the availability of HST.
	www.astr.ua.edu /gifimages/m101b.html (248 words)

	M101, the Pinwheel Galaxy! (Site not responding. Last check: 2007-10-27)
		M101, one of the Messier Objects, is a Pinwheel Galaxy located in the constellation, Ursa Major.
		Although it is the brightest of a group of at least 9 galaxies, from a low-powered telescope on Earth, only its center is visible to the eye.
		Yet, M101 is revealed as one of the most noticeable Grand Design spirals in the sky.
	www.msu.edu /~gloverje/m101.htm (260 words)

	Chandra :: Photo Album :: M101 :: 01 Mar 04
		These mysterious X-ray sources, marked with green diamonds in the image, are called "quasisoft" sources because they have a temperature in the range of one to four million degrees Celsius.
		A total of 72 quasisoft sources were discovered in the four galaxies: M101, M83, M51, and NGC 4697.
		Until a few years ago, astronomers only knew of two sizes of fl holes: stellar fl holes with masses about ten times that of the Sun, and supermassive fl holes located at the centers of galaxies, with masses ranging from millions to billions times that of the Sun.
	chandra.harvard.edu /photo/2004/m101/index.html (422 words)

	APOD: 2003 March 10 - M101: The Pinwheel Galaxy (Site not responding. Last check: 2007-10-27)
		Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
		A striking example is M101, shown above, whose relatively close distance of about 22 million light years allow it to be studied in some detail.
		M101 is so large that its immense gravity distorts smaller nearby galaxies.
	antwrp.gsfc.nasa.gov /apod/ap030310.html (130 words)

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