What planets have humans landed on?

Explanation: Only our two nearest neighbours Venus and Mars have been landed on. Landing on another planet is technically challenging and many attempted landings have failed. Mars is the most explored of the planets.

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One may also ask why does elon musk want to go to mars?

Elon Musk wants SpaceX to reach Mars so humanity is not a 'single-planet species' Elon Musk remains focused on his vision for SpaceX: Establishing a permanent human presence on Mars. "We don't want to be one of those single-planet species; we want to be a multi-planet species," Musk said on Friday. Then, can plants grow on mars? Growing crops on Mars Scientists have conducted plant experiments simulating Martian conditions using volcanic soil in Hawaii, which is known for its similarity to Martian soil. These experiments found that plants can actually grow in these soils.

Is Mars cold or hot?

Mars may look hot, but don't let its color fool you -- Mars is actually pretty cold! In orbit, Mars is about 50 million miles farther away from the Sun than Earth. That means it gets a lot less light and heat to keep it warm. Mars also has a hard time holding onto the heat it does get. How long would you survive on Mars? It's relatively cool with an average annual temperature of -60 degrees Celsius, but Mars lacks an Earth-like atmospheric pressure. Upon stepping on Mars' surface, you could probably survive for around two minutes before your organs ruptured.

One may also ask how close could you get to the sun without dying?

You can get surprisingly close. The sun is about 93 million miles away from Earth, and if we think of that distance as a football field, a person starting at one end zone could get about 95 yards before burning up. That said, an astronaut so close to the sun is way, way out of position. Can you walk on Mars? Thanks to the new advances in artificial intelligence (AI), it's now possible to virtually walk around and explore Mars. And we don't mean computer-generated imagery (CGI) of Mars, but the real Martian surface!

Answer: From the table we see that Mercury has the greatest percentage of oxygen in its atmosphere.