earth
Although several spacecrafts have been sent to Venus, no alien spacecrafts have been discovered on its surface.
Venus is the terrestrial planet that has not had a successful spacecraft landing. While several spacecraft have been sent to Venus, they have had difficulty due to its harsh environment, including high temperatures and atmospheric pressures.
so they can go out on mars and other planets
N.a.S.A sent spacectafts to mares called mariner spacecrafts.
Planets that have been visited by spacecrafts include Mars, Venus, Mercury, Jupiter, Saturn, Uranus, and Neptune. Additionally, the spacecraft Voyager 2 has conducted flybys of both Uranus and Neptune.
The Venera series of probes sent by the USSR .
N.a.s.A sent the Apollo spacecrafts in space.
No - satellites do not go to the moon. Satellites orbit planets/moons/objects with gravity in space.
They are sometimes called "major planets" to distinguish them from the "minor planets" (the asteroids) and "dwarf planets" like Pluto.
There are eight planets, which can also be loosely descibed as major planets. Below that there are dwarf planets and then minor planets, also know as asteroids.
Voyager 1 flew by Jupiter and Saturn. Voyager 2 flew by Jupiter, Saturn, Uranus, and Neptune.
You seem to be misinformed. The first US spacecraft was Mariner 10. This was followed by Messenger. There have not been others.