Odd Black Hole Defies Explanation

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Astronomers have found what appears to be a black hole 25 to 40 times the mass of our Sun, a weight class not previously known to exist.

Black holes can't be seen, because any light that enters them is trapped. So to find black holes, scientists look for intense radiation from around them as well as their gravitational effects on nearby gas and stars.

Black holes come in two distinct varieties, scientists know. A stellar black hole results from the collapse of a single, massive star and is typically a few times the mass of the Sun. Supermassive black holes anchor the centers of many galaxies and can harbor millions or billions of solar masses.

"There's a big gap there," said Philip Kaaret of the Harvard-Smithsonian Center for Astrophysics. Kaaret thinks he's found one that helps fill the gap.
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http://www.space.com/scienceastronomy/blackhole_medium_040608.html