Astronomers have finally confirmed the existence of a group of black holes that are too hefty to be born from normal stars, yet too slim to anchor galaxies.

According to Vanderbilt University astrophysicist Krystal Ruiz-Rocha, these bodies have masses of 100 to 300 times that of the Sun, and emerged in data from the third observing run of the gravitational‑wave detectors LIGO and Virgo.