 In new models of the formation of the black hole, the star that will form the black hole is nearly 100 times the mass of our Sun, orbiting a second star with mass of about .In such an orbit, the future black hole is able to start transferring mass while it is still fusing hydrogen into helium.As a result, it loses most of its hydrogen becoming a Wolf–Rayet star and shedding the rest of the envelope in the form of stellar wind, exposing its core.