Have you ever slept under an open sky and realized how beautiful the night sky appears? Once there was a time when our ancestors just saw the beautiful sky and framed interesting stories about it. None of them knew about the beautiful world lying besides this earth. The stars were considered to be a decoration which merely increased the beauty of the night sky and no one was even aware of any other planets besides the earth.
But today we earthlings are not only aware of other planets and stars but have also stepped on them. All this started from the discovery of a then considered mere instrument telescope which today hides behind its lens the treasure of beauty of the universe. Today earth owns many powerful telescopes who proudly marks their presence on earth through the demonstration of the knowledge of earthlings about the space and universe. Given below are the list of few of greatest telescopes of the earth who have dived us deep into the beautiful night sky .
1. Hubble Space TelescopeNamed after the great astronomer Edwin Hubble, Hubble space telescope was launched into the lower orbit of the earth during the 1990 and is still in operation. It is one of the largest and most versatile telescopes of the world.
2. Compton Gamma Ray ObservatoryA space observatory detecting light from 20 keV to 30 GeV in Earth orbit from 1991 to 2000. It featured four main telescopes in one spacecraft, covering X-rays and gamma rays, including various specialized sub-instruments and detectors. This telescope was launched from the space shuttle Atlantis on 5 April, 1991 and operated till 1 June, 2000.
3. Chandra X- ray ObservatoryPreviously known as the Advanced X-ray Astrophysics Facility (AXAF) by NASA on July 23, 1999. It has better sensitivity and resolution towards X- rays.
4. Spitzer Space TelescopeThe Spitzer Space Telescope (SST), formerly the Space Infrared Telescope Facility (SIRTF), is an infrared space launched in 2003. It is the fourth and final of the NASA Great Observatories program. The planned mission period was to be 2.5 years with a pre-launch expectation that the mission could extend to five or slightly more years until the onboard liquid helium supply was exhausted.