Physics
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007natph...3..450u&link_type=abstract
Nature Physics, Volume 3, Issue 7, pp. 450-451 (2007).
Physics
2
Scientific paper
Owing to difficulties in directly detecting them, the number of
extremely obscured black holes in the universe is unknown. Measurements
of the cosmic X-ray background shed light on this mystery.
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