Hilo astronomer helps size up the first black hole ever detected

    CYGNUS X-1: The most massive black hole near to Earth
  • PETE WHEELER/International Centre for Radio Astronomy Research

    An artist’s impression of the Cygnus X-1 system. A stellar-mass black hole orbits with a companion star located 7,200 light years from Earth.

A Hilo-based astronomer has joined a team that’s rewriting everything we know about the massive black hole Cygnus X-1.