For many reasons. The distance and time to get there is one. The distance is always changing between 1.6 billion miles to 1.98 billion miles. Planning the right trajectory to get there would be difficult. It took almost 10 years for Voyager 2 to get to it, which was a space probe. Having enough fuel to get there and enough supplies to keep people alive for that long would be a major problem. There would be many other technical problems. So it would not be an easy task for these and other reasons.
No human has, yet.
Nobody has ever done that yet.
Voyager II came within 81,500 km of Uranus in January of 1986, on its way to Neptune. No human has ever gone farther than Earth's moon.
Since Uranus is a giant planet with massive gravity and an atmosphere poisonous to human life, and since no human has ever be to or near Uranus, there are no fun things that you can to there.
No person has ever been to the planet Uranus or even to the moons of the planet Uranus (which would be much easier to visit). Indeed, human beings have never been anywhere farther than the moon. Automated probes have been sent to the edge of the solar system and out into interstellar space, but human beings have not gone nearly that far.
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If a human were to travel to Uranus, they would immediately choke, or freeze. This would happen because of the low temperatures, and the low amount of oxygen.
No, it is not possible for a human to live on Uranus.
So far (as of the year 2010) no human being has ever travelled to the planet Mars. Whether such travels will ever happen in the future would be difficult to predict. In the current economic climate, it is not likely that anyone is going to fund that kind of travel.
Voyager 1 and Voyager 2.
They would fall to the core because the planet's surface is made of gas but the core is made of iron and other minerals.
Yes, I think it's highly possible that humans will eventually travel to the planet of Uranus. However, I do not think it will happen during my lifetime.