‘Ultracool subdwarf’ stars speeding through space

(The Telegraph): A recently discovered family of peculiar wandering stars may include a visitor from another galaxy, scientists believe. The stars, described as "ultracool subdwarfs" follow very unusual paths around our galaxy, the Milky Way. They have low temperatures and are small enough to be close to planet-like objects. Only a few dozen ultracool subdwarfs, which are up to 10,000 times fainter than the Sun, have been identified. One of the oddest aspects of the stars is the rapid speed at which they travel. They have been clocked at more than a million miles per hour. Professor Adam Burgasser said: "If there are interstellar cops out there, these stars would surely lose their driver’s licences."

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