Hubble Spies 'Missing-Link' Mid-Size Black Holes
- Astronomers have detected what could be a 'missing link' in
the development of the universe: mid-size black holes that
are neither supermassive nor as small as a single exploded star.
The middling black holes were spotted using the Hubble Space
Telescope in two separate globular star clusters in Earth's
celestial neighborhood, astronomers said on Tuesday at a
briefing at NASA headquarters.