Name the space probe that was used to study the Sun.
The space probe Ulysses was launched in 1990 by a U.S. Shuttle under the joint project by NASA and European space Agency and arrived near the Sun in 1994 in a three and half years journey via Jupiter covering a distance of 150 million kilometers. It went into a polar orbit around the Sun and transmitted a large amount of useful data back to Earth.
Name the powerful optical telescope placed in Earth orbit.
The Hubble Space Telescope was launched into Earth orbit by the space shuttle “Discovery” in 1990, and is designed to transmit useful data about the universe better than Earth based telescopes.
In January 1994, a historic repair of its main mirror was carried out after 30 hours of space walks by five astronauts sent on a space shuttle at a cost of $ 360 million. NASA announced that it had repaired the fault. It now performs 10 times better than any ground based instruments.