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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.
What else can I help you with?
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.
What was the year the first planet was landed on?
The mariner spacecraft first landed on Mars 1971 I think.
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.
Which planet has man landed on?
Human have landed on the Moon, not a planet. It was NASA's Apollo missions which successfully landed humans on the Moon from 1969 to 1972. No human has landed on any other planet besides Earth's Moon.
What planet is the only one on which unmanned spacecraft have successfully landed and explored?
Venus is the only planet where unmanned spacecraft have successfully landed and explored. The Soviet Union's Venera program landed several probes on Venus in the 1970s and 1980s, providing valuable data about the planet's atmosphere and surface conditions.
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 was the year the first planet was landed on?
The mariner spacecraft first landed on Mars 1971 I think.
What spacecraft landed on mars moons?
The Mariner spacecraft landed on the planet Mars, and the Apollo spacecraft landed on 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.
Which planet has man landed on?
Human have landed on the Moon, not a planet. It was NASA's Apollo missions which successfully landed humans on the Moon from 1969 to 1972. No human has landed on any other planet besides Earth's Moon.
Has any human landed on the planet mercury?
No.
What planet is the only one on which unmanned spacecraft have successfully landed and explored?
Venus is the only planet where unmanned spacecraft have successfully landed and explored. The Soviet Union's Venera program landed several probes on Venus in the 1970s and 1980s, providing valuable data about the planet's atmosphere and surface conditions.
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.
What was the probes name that landed on the planet titan?
Huygens
