A runaway star moves fast in an unusual direction
Stars in our Milky Way galaxy move in a more or less orderly way. A star that moves differently from the general stream of stars is known as a runaway star. The post A runaway star moves fast in an unusual direction first appeared on EarthSky .
A Hubble Space Telescope image reveals a cloud of gas and dust called 30 Doradus, also known as the Tarantula Nebula. Within this nebula, a star called GD 50 appears to have been ejected from its original position. GD 50 is a white dwarf star, slightly more massive than our sun, but smaller than the Earth. Its swift movement through space, in the same direction as stars in the Pleiades cluster, led astronomers to conclude that it was born in the Pleiades before being ejected, possibly after a close encounter with another star.
Astronomers identify certain stars as "runaway stars" due to their unusually fast speeds and directions compared to the general movement of stars in the Milky Way galaxy. These stars were once part of star clusters, either bound in binary star systems or open clusters. Runaway stars can be ejected from these clusters through two main scenarios: encounters between binary star systems or supernova explosions in multiple star systems.
Two other examples of runaway stars are AE Aurigae, 53 Arietis, and Mu Columbae. These stars are all moving away from each other rapidly, and tracing their paths backwards reveals that they intersected near the Orion Nebula about 2 million years ago. The surrounding Barnard's Loop may be the remnant of a supernova explosion that launched these stars as runaway stars.
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