We have sent probes to Venus, the problem with a manned mission is that we couldn't store the food needed to go that far. The people manning the mission would starve. But about a year ago a man is Sweden was able to survive without food for 2 months by going into human hibernation. If we could learn how to put people into this state we may be able to go farther into space without the need to store large amounts of food and water. Making it possible to go to Venus, or other planets. The other problem is that anything that we can make a rocket out of would melt in about 2 hours. But we could sent the astronauts there and later send another rocket to pick them up. we would just need something that wouldn't melt to make the space suits out of.