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the planets containing life form other than earth may have a dangerous species, or the planet itself may be dangerous.
It is highly unlikely that any other planet in our solar system will. That does not preclude the possibility of life being elsewhere in the universe.
No, not yet at least. The only object that astronauts have been to other than Earth is the moon, which is a moon rather than a planet. There other planets are much farther away, but there are some plans to land people on Mars.
It's highly unlikely that Jupiter was the first planet. There's no evidence that Jupiter formed any earlier than other planets in our solar system, and no reason at all to believe that planets in other older solar systems might not have formed long ago.
It's extremely unlikely that anyone alive today will ever stand on any planet other than Earth.
the planets containing life form other than earth may have a dangerous species, or the planet itself may be dangerous.
Of course we will. But shall we?
A perfect circle means the planet is a perfect sphere (very unlikely) and no other gravitational force other than the body at the center of the orbit affecting its rotation. In our Solar System, there are many things that will interfere with that. (like the moons and other planets) It's not an impossible situation, but it's VERY unlikely.
It's not necessarily better, but it's the closest planet that we can get to.
It is highly unlikely that any other planet in our solar system will. That does not preclude the possibility of life being elsewhere in the universe.
because there is no air and the other planets are far away to visit.
Probably. Astronomers estimated that there are at least 100 billion planets in the galaxy, a good number of which may be similar to Earth. It seems pretty unlikely that Earth would be the only planet to develop life.
No human has really visited any planet other than Earth; the Moon isn't a planet. However, spacecraft have visited other planets, such as the Spirit and Opportunity rovers, who went to Mars
Unlikely in out own solar system, but quite likely in other parts of the universe. Some say that the asteroid belt is a planet that failed to form.
No one visited Jupiter. It is too far away and we do not possess the technology to visit other planets, and they definitely didn't have that technology back in the 1630s
No, not yet at least. The only object that astronauts have been to other than Earth is the moon, which is a moon rather than a planet. There other planets are much farther away, but there are some plans to land people on Mars.