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Montage of planets and some moons that the two Voyager spacecraft have visited and studied. It is the only program that visited all four outer planets. A total of nine spacecraft have been launched on missions that involve visits to the outer planets; all nine missions involve encounters with Jupiter, with four spacecraft also visiting Saturn.
Neptune's rings had been observed from Earth many years prior to Voyager 2 's visit, but the close inspection revealed that the ring systems were full circle and intact, and a total of four rings were counted. [4] Voyager 2 discovered six new small moons orbiting Neptune's equatorial plane, dubbed Naiad, Thalassa, Despina, Galatea, Larissa and ...
4.0: 1942 Stardust: 2002 3,079: 1,230: Flyby 25143 Itokawa: 0.5 × 0.3 × 0.2 (350 meters) 1998 Hayabusa: 2005 landed: landed: Landed; returned dust samples to Earth in 2010 - first sample return mission from asteroid; smallest asteroid visited by a spacecraft, first asteroid visited by a non-NASA spacecraft. 2867 Šteins: 4.6: 1969 Rosetta ...
Telescope data may have helped researchers figure out why. Four years ago, astronomers noticed the abundant clouds on Neptune had largely disappeared. Telescope data may have helped researchers ...
Neptune has long been known to have white clouds circling it, but images of the furthest planet in the solar system have shown this changing over time - the most recent image, taken by the Hubble ...
[38] [2] The concept describes an entrycraft that would brake using the drag of Pluto's thin but highly spread-out atmosphere. Once on Pluto's surface, the vehicle would exploit Pluto's low gravity to hop between sites using propellant. This is similar to NASA's Triton Hopper concept for exploring Neptune's largest moon Triton.
All planets in the Solar System, plus their major moons along some asteroids and comets, have now been visited to varying degrees by spacecraft launched from Earth. Through these uncrewed missions, humans have been able to get close-up photographs of all the planets and, in the case of landers, perform tests of the soils and atmospheres of some.
Twelve people have walked on the surface of the Moon during the Apollo program, at a cost of more than $25 billion. Granted, it's not something everyone gets to experience.