No human has really visited any planet other than Earth; the Moon isn't a planet.
However, spacecraft have visited other planets, such as the Spirit and Opportunity rovers, who went to Mars
Mars is the next one on the agenda, at the moment.
A person who studies the planets and stars is an astrologist.
No new planets have been added 08/2011
Most likely just Mars. Space travel is incredibly expensive and most planets are too hostile to visit. The closest we will get to visiting other planets will probably be with robots or just in orbit of them. Then again I can't be 100% sure.
All of the planets are in the same atmosphere. All of the planets are unique. All of the planets are considered planets. All of the planets have moons. All of the planets are named after a mythical person or thing.
In Athens, Greece
If you visit the NASA website or even search for the "Milky Way", you can get a list of planets in our solar system. There are only 9 planets, 8 if you don't count dwarf planet Pluto.
The firsrt priority in this venture is to make money.
Tim Berners Lee. It was called WorldWideWeb.
A person who studies planets and galaxies is called an astronomer. Is that the answer you were looking for?
because they feel like it
a person who studies planets is a planetologist.
yes, yes you can
Of course we will. But shall we?
9 including earth
mars because the scientists are searching right now