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Voyager 2 ' s trajectory from the Earth, ... it performed a close fly-by of Triton, Neptune's largest moon, passing within about 40,000 km (25,000 mi). ...
Mars comes closer to Earth more than any other planet save Venus at its nearest—56 million km is the closest distance between Mars and Earth, whereas the closest Venus comes to Earth is 40 million km. Mars comes closest to Earth every other year, around the time of its opposition, when Earth is sweeping between the Sun and Mars. Extra-close ...
In The Martian, by Andy Weir, the spaceship Hermes uses a constant thrust ion engine to transport astronauts between Earth and Mars. In Project Hail Mary, also by Weir, the protagonist's spaceship uses a constant 1.5 g acceleration spin drive to travel between the Solar System, Tau Ceti and 40 Eridani.
A spacecraft traveling from Earth to Mars via this method will arrive near Mars orbit in approximately 8.5 months, but because the orbital velocity is greater when closer to the center of mass (i.e. the Sun) and slower when farther from the center, the spacecraft will be traveling quite slowly and a small application of thrust is all that is ...
Studies since the mid-1990s have shown that the belt is dynamically stable and that comets' true place of origin is the scattered disc, a dynamically active zone created by the outward motion of Neptune 4.5 billion years ago; [18] scattered disc objects such as Eris have extremely eccentric orbits that take them as far as 100 AU from the Sun. [a]
The lowest energy transfer to Mars is a Hohmann transfer orbit, a conjunction class mission which would involve a roughly 9-month travel time from Earth to Mars, about 500 days (16 mo) [citation needed] at Mars to wait for the transfer window to Earth, and a travel time of about 9 months to return to Earth. [9] [10] This would be a 34-month trip.
The axial tilt of Neptune is 28.32°, [138] which is similar to the tilts of Earth (23°) and Mars (25°). As a result, Neptune experiences seasonal changes similar to those on Earth. The long orbital period of Neptune means that the seasons last for forty Earth years. [109] Its sidereal rotation period (day) is roughly 16.11 hours. [12]
Pioneer 11 was the first spacecraft to fly by Saturn. Mars 4: Mars 21 July 1973 10 February 1974 205 days (6 months, 21 days) Mars 4 failed to enter Mars orbit and flew by it instead. [88] Mars 6: Mars 5 August 1973 12 March 1974 220 days (7 months, 8 days) The Mars 6 bus flew by Mars at a minimum distance of 1600 km. Also carried a lander. [13 ...