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Artist's illustration of Andromeda/Milky Way Merger. Credit: NASA; ESA; Z. Levay and R. van der Marel, STScI; T. Hallas; and A. Mellinger
We tend to think of stars as stationery objects in the sky, except for their slow westward drift across the sky as the Earth rotates. The reality is different though, stars do move but due to the vast distances in interstellar space, that motion is largely not noticeable. There are exceptions such as Barnard’s star in the constellation Ophiuchus. This inconspicuous red dwarf star moves 10.
Typically the motion of stars is the result of their motion around the centre of a galaxy. Our own star the Sun, takes 220 million years to complete one orbit of the centre of the Milky Way. The origin of the HVSs high velocity is believed to stem from gravitational interactions between binary stars and black holes. The idea was proposed by Jack Gilbert Hills is a stellar dynamicist, born on 15 May 1943.
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