Scientists think two, or even three, black holes could live just about 150 light years from our planet.
Gaia BH1 is located 1,560 light-years away from Earth, while Gaia BH2 lies around 3,800 light-years away. Even though this means both black holes are located in Earth’s backyard ,they are still over 10 and 20 times as far away as the Hyades cluster and its potential black hole duo or trio.
Both this new research and the prior discovery of Gaia BH1 and BH2 exemplify how Gaia, launched in 2013, has been reshaping astronomy. The space telescope made it possible for astronomers to study the positions and velocities of individual stars in clusters like the Hyades for the first time. Gaia is capable of such breakthroughs because it can accurately measure the positions and motions of billions of stars against a background sky. Tracking stellar movements with such high precision helps to reveal gravitational influences tugging on these stars, even if that influence comes from hidden objects like small stellar mass black holes.
"This observation helps us understand how the presence of black holes affects the evolution of star clusters," researcher author and University of Barcelona researcher Mark Gieles said."These results also give us insight into how these mysterious objects are distributed across the galaxy."
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