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Article: X-ray telescope detects black holes of universe
- Article from:
- The Milwaukee Journal Sentinel (Milwaukee, WI)
- Article date:
- March 18, 2001
- Author:
CopyrightCopyright 2001 The Milwaukee Journal Sentinel. Provided by ProQuest LLC. (Hide copyright information)
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X-ray telescope detects black holes of universe
By PAUL RECER
Associated Press
Sunday, March 18, 2001
Washington -- The early universe teemed with supermassive black
holes spewing X-rays across the heavens, according to data from an
orbiting telescope that picked up images from far, far away and long,
long ago.
The Chandra X-ray telescope, in a study that focused on small
sections of the sky for days-long exposures, has captured faint X-
rays streaming from black holes up to 12 billion light-years away,
astronomers said last week.
"The Chandra data show us that giant black holes were much more
active in the past than at present," said Riccardo Giacconi, a Johns
Hopkins University astronomer.