In September 2020, the detection by the Chandra X-ray Observatory [38] of a candidate exoplanet, named M51-ULS-1b, orbiting the high-mass X-ray binary M51-ULS-1 in this galaxy was announced. If confirmed, it would be the first known instance of an extragalactic planet: a planet outside the Milky Way.

2024年8月25日 · The Whirlpool Galaxy, M51, is a spiral galaxy located 31 million light-years away. It highlights the attributes of a typical spiral galaxy, including graceful, curving arms, pink star-forming regions, and brilliant blue strands of star clusters.

M51 was originally thought to be “a spiral nebula” until Edwin Hubble was able to identify Cepheid variable stars in some of these spiral nebulae. This provided evidence that these stars were so far away that they must be entirely separate galaxies.

2024年12月14日 · Explanation: An intriguing pair of interacting galaxies, M51 is the 51st entry in Charles Messier’s famous catalog. Perhaps the original spiral nebula, the large galaxy with whirlpool-like spiral structure seen nearly face-on is also cataloged as NGC 5194.

2021年9月2日 · Perhaps the original spiral nebula, the large galaxy with well defined spiral structure is also cataloged as NGC 5194. Its spiral arms and dust lanes clearly sweep in front of its companion galaxy (top), NGC 5195.

2005年4月25日 · NASA released new views today of two of the most well-known objects Hubble has ever observed: the Whirlpool Galaxy (spiral galaxy M51) [left] and the Eagle Nebula [right]. These new images are among the largest and sharpest Hubble has ever taken. They were made with Hubble's newest camera, the Advanced Camera for Surveys (ACS).

2020年6月30日 · This image of M51 was taken with the NOAO Mosaic CCD camera on the National Science Foundation's 0.9-meter telescope located at Kitt Peak National Observatory near Tucson, AZ. Located in the constellation of Canes Venatici, the "hunting dogs", M51 consists of the large spiral galaxy NGC5194 and its smaller companion NGC5195.

Messier 51 or M51 (also designated NGC 5194/5) is a spiral galaxy in the constellation Canes Venatici. It has an apparent visual magnitude of 8.4 and its angular diameter is 11x7 arc-minutes. M51 lies at an estimated distance of 37 million light years.

2015年6月3日 · Messier 51 (M51), better known as the Whirlpool Galaxy, is a famous grand-design spiral galaxy located in the constellation Canes Venatici. The Whirlpool Galaxy has an apparent magnitude of 8.4 and lies at an approximate distance of 23 million light years from Earth. It has the designation NGC 5194 in the New General Catalogue.

M51, also known as the Whirlpool Galaxy, is a grand design spiral galaxy located in the constellation of Canes Venatici. It's one of the most famous galaxies in the sky, appearing face-on when viewed from Earth. At magnitude +8.4, it's relatively bright and visible in binoculars, especially from dark sites.