That's a bit like asking which rock is the most nutritious.
Mars is not by any means "habitable", but it's probably the one requiring the LEAST amount of protective gear for a human to stroll around on the surface. On any planet, humans would need, at the bare minimum, an oxygen supply. Mars is very cold in most places at most times, though midday near the equator can reach tolerable temperatures. I'm not sure if you'd need a pressure suit, but it probably wouldn't be a bad idea.
Unlike on Venus, Mars' atmosphere is not actively corrosive, and unlike Mercury it actually HAS an appreciable atmosphere ... it's thin (about the same as on Earth at 25 miles altitude), but it's there. The outer planets don't really have surfaces in the conventional sense, so Mars wins kind of by default.
Viewed from Earth, Venus is the brightest planet.
Earth
It is smaller than Earth.
Mercury is the smallest planet in our solar system. Pluto might have been the smallest planet, but it has now been reclassified as a "dwarf planet." The smallest planet in our solar system now is Mercury. There might well be billions of smaller planets outside for solar system. The smallest exoplanet found so far is about twice the size of the Earth.
The duration of Planet Earth - TV series - is 3000.0 seconds.
Mars.
Mars
earth
mars
the planet earth
Besides Earth, mars is the most explored planet.
So far no planet has been discovered that would support our kind of life, certainly not in our solar system
Jupiter
mars
Jupiter
The Earth is a planet in our solar system and the third planet from the sun. The Earth is the only planet within our solar system that can support life.
what does earth spin on besides a inmaginary line? ============== Planet Earth rotates on its axis.