because mars is a planet without gases
Mariner 4 was the first ship to visit Mars.
As of now, no human has visited Mars. Unmanned missions, like those from NASA's rovers, have been conducted to explore the planet's surface. Plans for crewed missions to Mars are being developed for the future.
No, not yet. So far, we've only managed to send machines there.
No human has visited Mars yet. However, there are plans by space agencies like NASA to send astronauts to Mars in the future using advanced spacecraft and technology.
2007 hia
A totally enclosed and controlled environment, with sufficient food, water and air for the duration of the visit
As of now, manned missions to Mars are still in the planning stages and have not yet taken place. However, several space agencies and private companies are working on developing the technology needed to make human missions to Mars a reality in the future.
Mariner 4 was the first ship to visit Mars.
You can visit them at any time, but it is best and easiest to visit them in the summer.
Mars.
Mars because it would be the next easiest to inhabit, terraformed or not. The rest in the this solar system are to harsh to make it worth while. And beyond this solar system it too far for humans to travel at present.
No.