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I assume you mean people, as we have sent robots to land on multiple planets. Its simple really, the journey would take years. There are obvious big risks, like flying through space for years, landing on a planet we're not adepted to, taking off again, and flying back home. Other major problems include air, water and food supply.
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∙ 15y ago
Wiki User
∙ 8y agoIt is much too far away. The New Horizons space probe took nearly 10 years to reach Pluto and was moving too fast to land. A voyage that intends to land would take at least 12 years. That is far longer than a person could survive in space.
Wiki User
∙ 14y agoMercury has never been landed on because the environment of Mercury is too toxic (acid rain) and stormy (hurricane force winds).
Wiki User
∙ 12y agobecause there's no air on mercury
Wiki User
∙ 12y agoThey have.
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What planet did sally ride go on?
She never landed on a planet. She was on the space lab. Only one planet has been landed on by man and that is the moon.
Who is the first man landed on Saturn?
Nobody has landed on Saturn yet. For that matter, nobody has landed on ANY planet other than Earth, only on the Moon. The first planet to land on is expected to be Mars.
What type of sentence is after the Mars pathfinder landed on the planet Mars?
"After the Mars pathfinder landed on the planet Mars" is not a sentence. You must complete this sentence by making it read something like the following: After the Mars pathfinder landed on the planet Mars, it took pictures of the geographical features.
What was the year the first planet was landed on?
The mariner spacecraft first landed on Mars 1971 I think.
Has a space shuttle landed on any planets?
Once per completed mission, the shuttles have landed on Planet Earth.
What planet did sally ride go on?
She never landed on a planet. She was on the space lab. Only one planet has been landed on by man and that is the moon.
Has anyone landed on Jupiter?
No one has landed on any planet, only the moon was ever visited by humans.
Who first landed on Uranus?
No one has landed on Saturn. In fact there isn't anywhere to land as it is a gas giant.
Which was the first planet on which a space probe landed?
Venus was the first planet on which a space probe landed.
What spacecraft landed on mars moons?
The Mariner spacecraft landed on the planet Mars, and the Apollo spacecraft landed on the moon.
Has any human landed on the planet mercury?
No.
Who is the first man landed on Saturn?
Nobody has landed on Saturn yet. For that matter, nobody has landed on ANY planet other than Earth, only on the Moon. The first planet to land on is expected to be Mars.
What type of sentence is after the Mars pathfinder landed on the planet Mars?
"After the Mars pathfinder landed on the planet Mars" is not a sentence. You must complete this sentence by making it read something like the following: After the Mars pathfinder landed on the planet Mars, it took pictures of the geographical features.
What was the year the first planet was landed on?
The mariner spacecraft first landed on Mars 1971 I think.
What was the very first space probe that landed on an alien planet?
The probe "Venera 7" sent by the USSR was the first. It landed on the planet Venus, in 1970 I think.
Would you die if you landed on Uranus?
yes because its a gas planet and its the coldest planet
What is the name of the rover that landed on the planet Mars?
curosity
