 Date: 2016-03-03 18:01:57Space observatories Astronomy Outer space Observational astronomy International X-ray Observatory Physical cosmology Astronomical surveys Wide Field Infrared Survey Telescope Galaxy European Southern Observatory Large Synoptic Survey Telescope Redshift | |  A
Wide-‐Field
X-‐ray
Probe
A.
Ptak
(NASA/GSFC;
)
for
the
N-‐WFI
and
WFXT
teams
The
two
highest-‐priority
lar
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