I believe it was Russian probes skirmishing Venus.
There is no scientific evidence to suggest that Earth has been explored by other life forms from beyond our planet. The search for extraterrestrial life continues, but no confirmed contact or exploration has occurred.
I'm not sure what "first" means in this context. Venus can be closer to Earth than any other planet, and Venus can be brighter than any other planet, but it's not so all the time.
Venus
If the "first an" is meant to be "first man", then the answer is that no man has been on any planet other than the earth.
All planets other than Earth could be considered alien. Earth is the only planet known to harbor life.
.How do you know that earth isn't the other planet?
No, not always. Earth as the planet, yes. "Go out and dig in the earth" no.
Venus was "hit" by the soviet Venera 3 in 1966.
5th largest planet out of the eight in our solar system.
The first space probe to take pictures of a planet other than Earth was Mariner 2, which flew by Venus on December 14, 1962. It successfully transmitted data and images back to Earth, providing humanity with its first close-up views of another planet. This mission marked a significant milestone in space exploration and planetary science.
The only planet on which people have walked on Earth. The only world other than Earth where people have walked is the moon, but the moon is not a planet.
If man developed on this planet first and only, then the Earth or Tellus is the only planet inhabited by man. It might be disputed if our planet is the first one or the only one. Science does not know for certain but the odds with to days knowledge are against theories of man coming to earth from other planets.