Q&A: Black Holes
What are black holes made of?
When a collapsed star has more mass than three suns, it forms a
black hole in space. These bizarre objects are found in rare
double star systems or in the centers of galaxies where
supermassive black holes have formed. X-ray telescopes provide
an unequaled view of super- heated matter that is swirling
toward the event horizon of a black hole.
For more information
on black holes, please see our Black Hole Field Guide (http://chandra.harvard.edu/xray_sources/blackholes.html).