Space telescope to maintain. The Hubble Space Telescope was serviced by the Space Shuttle while many other space telescopes cannot be serviced at all. Space observatories can generally be divided into two classes: missions which map the entire sky (surveys), and observatories which focus on selected astronomical objects or parts of the sky. Satellites have been launched and operated by NASA, ISRO, ESA, Japanese Space Agency and the Soviet space program later succeeded by Roskosmos of Russia. As of 2018, many space observatories have already completed their missions, while others continue operating on extended time. However, the availability of space telescopes and
Space Shuttle: A Journey into Space Orbit, Docking, Deorbit Burn, Reentry, and Landing, each with its own set of instructions to follow. The original Atari 2600 version came with an overlay since it made use of all the switches. In an April 1984 review for "Video Games" magazine, Dan Persons wrote: "Space Shuttle" is not a game for everybody. It requires a considerable amount of patience and, perhaps not too surprisingly, a considerable amount of brainpower. Players who seek the visceral thrills of the standard shoot'em-up may ultimately find this simulation's complexity frustrating. But those of you who are ready for a richer, more sophisticated experience