As Pluto is no longer a planet - all of them.
All planets in our Solar System have had a flyby.
NASA has launched the Kepler mission to search for new planets.
Sorry to say but NASA is not a planet! NASA is an organization that studies the planets!
Most of the NASA planets fall in the world, although a few of them haven't, whereas relatively few non-NASA planets fall in the world.
nasa technically didn't visit any planets yet, but it has visited the moon (and was the first to send people to the moon), and it has also done many missions into lower earth orbit.
All of the planets in the Solar System have been visited by machines except for the planet Pluto. There was a machine that was launched in 2004 for a flyby to Pluto in 2014.
The NASA rover operates in space, on planets other than the Earth.
flyby A+
It depends on what kind of spacecraft we're talking about. There's this type of spacecraft called 'Flyby' Spacecraft. Flyby Spacecrafts are those who cannot observe distant objects. They would just flyby planets, asteroids, or whatever, and avoid being caught by a planet's magnetic field, or orbit. Please be more specific :)
No. NASA is not in the planet discovering business. That is done by others. NASA does send up stuff like the Hubble etc. but I think it is JPL that actually runs it. Oh, and there has never been anything to suggest that life has been discovered out there, by *anyone*.
NASA is a very big organisation it also have several observatories which monitor the stars and planets.
Yes, NASA has sent a couple of unmanned probes to examine Mercury, Mariner 10 which did a flyby and the MESSENGER orbiter.