Passage: Read the given passage and answer the questions that follow. The Hubble Space Telescope (HST) is the first sophisticated optical observatory placed into orbit around Earth. Earth’s atmosphere obscures ground-based astronomers’ view of celestial objects by absorbing or distorting light rays from them. A telescope stationed in outer space is entirely above the atmosphere, however, and receives images of much greater brightness, clarity, and detail than do ground-based telescopes with comparable optics. After the US Congress authorised its construction in 1977, the Hubble Space Telescope (HST) was built under the supervision of the National Aeronautics and Space Administration (NASA) of the United States and was named after Edwin Hubble, the foremost American astronomer of the 20th century. The HST was placed into orbit about 600 km above Earth by the crew of the space shuttle Discovery on 25 April 1990. The HST is a large reflecting telescope whose mirror optics gather light from celestial objects and direct it into two cameras and two spectrographs (instruments that separate radiation into a spectrum and record it). The HST has a 2.4 m primary mirror, a smaller secondary mirror, and various recording instruments that can detect visible, ultraviolet, and infrared light. Question: When was the Hubble Space Telescope placed into orbit?

1. 1990
2. 2000
3. 1980
4. 1977 Comprehension: Read the given passage and answer the questions that follow. The Hubble Space Telescope (HST) is the first sophisticated optical observatory placed into orbit around Earth. Earth’s atmosphere obscures ground-based astronomers’ view of celestial objects by absorbing or distorting light rays from them. A telescope stationed in outer space is entirely above the atmosphere, however, and receives images of much greater brightness, clarity, and detail than do ground-based telescopes with comparable optics. After the US Congress authorised its construction in 1977, the Hubble Space Telescope (HST) was built under the supervision of the National Aeronautics and Space Administration (NASA) of the United States and was named after Edwin Hubble, the foremost American astronomer of the 20th century. The HST was placed into orbit about 600 km above Earth by the crew of the space shuttle Discovery on 25 April 1990. The HST is a large reflecting telescope whose mirror optics gather light from celestial objects and direct it into two cameras and two spectrographs (instruments that separate radiation into a spectrum and record it). The HST has a 2.4 m primary mirror, a smaller secondary mirror, and various recording instruments that can detect visible, ultraviolet, and infrared light. SubQuestion No : 19