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Article: Study: Universe full of black holes; X-ray telescope: The study shows they were much more active in the past
- Article from:
- Telegraph - Herald (Dubuque)
- Article date:
- March 14, 2001
- Author:
CopyrightCopyright 2001 Telegraph - Herald (Dubuque). Provided by ProQuest LLC. (Hide copyright information)
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WASHINGTON (AP) - Supermassive black holes once dominated the
universe, sucking in gas, dust and whole stars and erupting with
surges of X-rays that have journeyed since for billions of years
across the heavens.
That's a picture of the early universe captured by the orbiting
Chandra X-ray telescope in a study that focused on small sections of
the sky for days-long exposures to capture faint X-rays streaming
from more than 12 billion light-years away.
"The Chandra data show us that giant black holes were much more
active in the past than at present," Riccardo Giacconi, a Johns
Hopkins University astronomer, said Tuesday at a news conference.
"If you look at the sky with X-ray eyes, you see ...