ASTROSAT spots brightest hard X- ray source Crab Nebula

Q.  ASTROSAT has spotted the brightest hard X ray source in the sky named _________________.
- Published on 19 Oct 15

a. Crab Nebula
b. Cygnus X-1
c. Both of the above
d. None of the above

ANSWER: Crab Nebula
 
ASTROSAT is the first Indian space observatory which has spotted Crab Nebula using the CZTI or Cadmium Zinc Telluride Imager. This is the brightest hard X-ray or highest energy X-ray source in the sky used to calibrate hard X-ray detectors. This proves ASTROSAT can sight X-ray sources. ASTRONAUT also spotted Cygnus X-1, a black hole source.

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