Mercury Probes have orbited Mercury and sent photos, but don´t look for human lading. Mercury is too hot. And solarradiation.
Venus - Under Venus´s thick blanker of clouds, temperatures rech about 900 degrees F. Air press is over 90 times that on Earth.
Earth - Is a only planet has oxigen from human to live
.
Mars - Mar is cold and frosty. Ist air is mosly unbreathable carbon dioxide. Dust storms are frequent. But it 's fairly close, and may have water underground. That s why it s worth a try.
Jupiter - Jupiter doesn t have a surface to land on! It s a huge ball of swirling gas above a deep, liquid ocean.
Saturn -Another ball of gas and liquid, like Jupiter. And it 's farther away.
Urano, Neptuno - Too far. Too cold. Too dark. For the time being, it 's impossible to think of visiting outer planets.