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Probes from Earth have visited every planet in the Solar System, but to date Voyager 2 is the only probe to fly past outer planets Uranus and Neptune. When New Horizons was launched in early 2006 its destination of Pluto was the 9th planet from the sun, but when it finally reached the remote frigid world in 2015 Pluto had been demoted to a dwarf planet.
The two gas giants Jupiter and Saturn have been explored more, and most missions have been to Earth's close neighbors Venus and Mars. However, in all the years humans have been engaging in space exploration the other inner rocky planet Mercury has only been visited by two probes many years apart - Mariner 10 in the mid 1970s and Messenger in the early 2010s, and neither landed on the planet's surface.
Mercury is apparently a logistical nightmare to explore. Being so close to the Sun and speeding around with an orbit of just 88 days, probes have to go extremely fast to reach it and getting them to orbit the planet is very difficult. Landing on the planet presents even more challenges, as Mercury has no atmosphere and a slow rotation of 59 days. The temperature can vary from 400 degrees centigrade during the day, and down below minus 170 degrees at night.
The two gas giants Jupiter and Saturn have been explored more, and most missions have been to Earth's close neighbors Venus and Mars. However, in all the years humans have been engaging in space exploration the other inner rocky planet Mercury has only been visited by two probes many years apart - Mariner 10 in the mid 1970s and Messenger in the early 2010s, and neither landed on the planet's surface.
Mercury is apparently a logistical nightmare to explore. Being so close to the Sun and speeding around with an orbit of just 88 days, probes have to go extremely fast to reach it and getting them to orbit the planet is very difficult. Landing on the planet presents even more challenges, as Mercury has no atmosphere and a slow rotation of 59 days. The temperature can vary from 400 degrees centigrade during the day, and down below minus 170 degrees at night.
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