Sharmila is a Seattle-based science journalist. She found her love for astronomy in Carl Sagan's The Pale Blue Dot and has been hooked ever since. She holds an MA in Journalism from Northeastern University and has been a contributing writer for Astronomy Magazine since 2017. Follow her on Twitter at @Sharmilakg.
Astronomers have long assumed that two black holes that circle close to each other are always destined to become one in a cataclysmic merger that spans eons.In a new study, physicists found that it is theoretically possible for two black holes to remain at a fixed distance from each other, thanks to their mutual gravitational pull being perfectly counterbalanced by the speed at which the universe is expanding.
One of the key assumptions in those theorems is that the region around black hole pairs is empty. However, according to the standard model of cosmology — our current best description of the universe — dark energy causes the universe to expand at an accelerated rate. This dark energy is sometimes considered equivalent to the puzzling cosmological constant in the theory of general relativity.
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