Do geologist go on the planets and check the soil and other things such as minerals?

Answer 1

No. Nobody has ever been farther away from Earth than the Moon.

Even samples collected there, were collected by only 12 people, and the distance to the Moon is less than 10 percent of

the distance to the nearest planet.

We have actual samples of rocks and soil from the moon. But no samples have ever been retrieved by astronauts from a planet other than our own, and no human being has ever handled them. An exception, of course, are meteorites that originated on other planets, and landed on Earth on their own accord. Any samples of rock or soil

on another planet that were ever "handled" were done so by a robot lander that was sent to the

planet, and the results were sent back to Earth by radio.