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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 .
The M51 SLBM is a French submarine-launched ballistic missile, built by ArianeGroup, and deployed with the French Navy. Designed to replace the M45 SLBM (in French terminology the MSBS – Mer-Sol-Balistique-Stratégique "Sea-ground-Strategic ballistic"), it was first deployed in 2010.
The Sherman M-50 and the Sherman M-51, both often referred to abroad as the Super Sherman, were modified versions of the American M4 Sherman tank that served with the Israel Defense Forces from the mid-1950s to early 1980s.
The Samsung Galaxy M51 is a mid-range Android smartphone manufactured by Samsung Electronics as part of their M series. It was announced in late August 2020 and released the following month. It was announced in late August 2020 and released the following month.
M51 MACI mine; M51 SLBM, a French nuclear ballistic missile; BMW M51, a 1991 straight-6 Diesel engine; Sherman M-51, an Israeli modification of American M4 Sherman tank; Eidgenössischer Stutzer 1851, a historical service rifle of the Swiss Army; Messier 51, a spiral galaxy also known as the Whirlpool Galaxy; Samsung Galaxy M51, a smartphone ...
The M51 Group is a group of galaxies located in Canes Venatici. The group is named after the brightest galaxy in the group, the Whirlpool Galaxy (M51A). Other notable members include the companion galaxy to the Whirlpool Galaxy ( M51B ) and the Sunflower Galaxy (M63).
The M51 Skysweeper (Gun, M51, Antiaircraft or Gun automatic, 75-mm T83E6, and E7, recoil mechanism, and loader rammer) was an anti-aircraft gun deployed in the early 1950s by both the U.S. Army and U.S. Air Force. It was the first such gun to combine a gun laying radar, analog computer (director) and an autoloader on a single carriage.
The BMW M51 is an inline-6 cylinder Diesel engine produced by the Upper Austrian BMW plant in Steyr from July 1991 through February 2000. Its predecessor is the BMW M21 , the successor is the BMW M57 .