Question

NASA's __________, the youngest member of the "Great Observatory" programme, has completed 15 years in space.
Compton Gamma Ray Observatory
Chandra X-ray Observatory
Hubble Space Telescope
Spitzer Space Telescope
Fermi Gamma-ray Space Telescope

Answer 1

NASA's Chandra X-ray Observatory , the youngest member of the "Great Observatory" programme, has completed 15 years in space.

Answer 2

NASA's Chandra X-ray Observatory the youngest member of the "Great Observatory" programme, has completed 15 years in space.