Which planet could an astronaut visit without the need for a spacesuit (and survive)?

Question

Quizplus · Accepted Answer

All planets in the solar system have environments that are extremely hostile to humans. The Moon has no atmosphere to breathe and extreme temperature fluctuations, Mars has a thin atmosphere with no breathable oxygen and also extreme temperatures, Mercury is extremely hot and also lacks an atmosphere, and Venus has a thick atmosphere with high pressure and temperatures high enough to melt lead. Therefore, an astronaut would need a spacesuit to survive on any of these celestial bodies.

Which Planet Could an Astronaut Visit Without the Need for a Spacesuit