You seem to be misinformed. The first US spacecraft was Mariner 10. This was followed by Messenger. There have not been others.
Although several spacecrafts have been sent to Venus, no alien spacecrafts have been discovered on its surface.
Venus has no natural satellites but probes have been sent their for many years now.
Yes, there have been probes sent to Mercury. Messenger and Mariner 10.
earth
No one has every been to Mercury. The furthest man has been is to the Moon. Probes have been sent to Mercury
2
N.a.S.A sent spacectafts to mares called mariner spacecrafts.
The Venera series of probes sent by the USSR .
john William has explored the planet mercury... but no one has been sent out to this planet
Mariner 10.
Two spacecraft have been sent to Mercury: Mariner 10 in 1974 and MESSENGER in 2004. MESSENGER orbited Mercury from 2011 to 2015, providing valuable data on the planet's geology, magnetosphere, and surface composition. The European Space Agency's BepiColombo mission, launched in 2018, is currently en route to Mercury and is expected to arrive in 2025.
N.a.s.A sent the Apollo spacecrafts in space.