What is the most dangerous place in the solar system?

Answer 1

I don't think this question has a meaningful answer. The answer for all planets except Earth is "you couldn't live there because X", where what X is varies, but then again dead is dead.

For all solar planets except Earth:

You couldn't breathe on any of them

You would roast on Mercury or Venus

You would freeze on any of the others

On Jupiter or Saturn, you'd freeze initially and then roast as you fell into the interior

There's no real "surface" to stand on on any of the outer planets

Answer 2

You mean for humans? Anywhere but the Earth is dangerous to us: all planets and moons besides Earth lack breathable air, a comfortable temperature, or an adequate atmospheric pressure to sustain human life. Most other planets also lack a magnetic field or ozone layer to prevent burns from the sun's ultraviolet rays, and all of them -- at least until we find out otherwise -- lack any plant or animal life required to support any colonization effort.

For example, Venus has a mean temperature of 460 °C (860 °F), an atmosphere of carbon dioxide poisonous to humans and a pressure of 93 bars, equivalent to twice the pressure endured by a military submarine 490 meters (1600 feet) underwater.

Answer 3

Dangerous, for us, would be any asteroid that is fairly large and that might potentially crash into Earth. No asteroid is currently known that has a significant probability of crashing into Earth any time soon.