Heavy Black Hole Jets in 4U1630 47 . ... Credit Copyright: NASA , CXC , M. Weiss Explanation: What are black hole jets made of? Many black holes in stellar systems are surely surrounded by disks of gas and plasma gravitationally pulled from a close binary star companion. ... The 4U1630-47 star system is depicted above in an artist's illustration, with a large blue star on the right and jets emanating from a black hole in the center of the accretion disc on the left. ... NASA Official: Jay Norris. ...