This black hole is five times the mass of our Sun, and it's getting bigger all the time, thanks to a normal star that has the colossally bad luck of being the black hole's partner in a binary star system.
In a universe of supermassive stars and galactic cannibalism, what makes astronomers call a star system "extreme"? Megaspeed. A group at University of Warwick found two white dwarf stars revolving around each other in a blinding 5.4 minutes.
Stars in the early universe probably formed in pairs, like the ones in this simulation created by a group of American astrophysicists. Their finding also has staggering implications: We may detect gravity waves, which has never been possible before.
Luke Skywalker's home planet, which orbits a binary star system, could be out there, according to Ryosuke Kita of Northwestern University, who presented this morning at the Astrobiology Science Conference 2008. Of the 200 or so star systems where we've found planets, about 20 percent are binary systems, and that…