Missing link' black hole discovered in unusual binary system with red giant star
The binary system G3425 exhibits some unusual and difficult-to-explain features. Astronomers recently discovered an exciting new black hole in the G3425 binary system, located about 5,800 light-years away. This discovery is even more thrilling because the black hole may belong to the "missing link" category of stellar-mass black holes. The visible star in this system is a red giant, a type of star formed when a star runs out of hydrogen fuel, causing its outer layers to expand dramatically. Our sun is expected to undergo a similar process in about 5 billion years, swelling to the orbit of Mars. However, unlike G3425, it is highly unlikely to have a black hole as a companion. In G3425, the red giant star has a mass around 2.7 times that of our sun. What truly fascinates scientists, though, is the black hole's mass, estimated to be between 3.1 and 4.4 times the sun's mass. This makes it one of the lightest black holes ever found and places it in the so-called "ma...