Mars is the next planet that could possibly be traveled to, and this is expected to take place within the next two decades. The NASA mission is called Constellation, and the planned spacecraft is called Orion. See the mission page at the Related link below.
Obama has recently announced that the next jump should be Mars since we have already been to the moon!
Saturn.
Mars
Venus
Jupiter
Jupiter.
mars
jupiter.
Venus, then Earth, then Mars.
The planet just beyond Jupiter is our solar system's sixth planet, Saturn.
Jupiter
Jupiter.
jupiter
The next planet after Ceres is Jupiter.
mars
Jupiter
Saturn
jupiter.
jupiter
Venus, then Earth, then Mars.
Saturn is the 6th major planet from the Sun. The planet closer is Jupiter, and the next planet farther away is Uranus.