________ space telescopes celebrated 30 years of its launch on April 24, 2020 ?

a) Spitzer
b) Astrosat
c) Odin
d) Hubble 

NASA’s Hubble Space Telescope celebrated 30 years of its launch on April 24, 2020. Hubble is one of the longest living Space Telescopes in the world. The Hubble Telescope had first detected the evidence of existence of black holes in the centre of the galaxy.