Robin,
Suppose that the Sun orbits about a black hole once every 27000 years
approximately.
Although that cannot be ruled out, there seems to be no good evidence
AFAIK that a black hole has been documented nearby (and perhaps cannot
be situated anywhere other than a galactic core) ... or is there?
Of course the putative object in question could be "black" for other
reasons...Robert Foot sez: "Since the physics of mirror matter would be
governed by laws different than those of ordinary matter, mirror matter
would be difficult to detect"
