There have been 95 exoplanets discovered in 2010. You'll need to be more specific on the question.
We won't know that until we are sure that we have discovered all of them.
The first confirmed exoplanet is called 51 Pegasi b. It was discovered on October 6th 1995 by Michel Mayor and Didier Queloz. Note: 51 Pegasi or 51 Pegasi a is the parent star.
which exoplanet is 'THE exoplanet'?
The darkest exoplanet is "TRES-2B".
No. An exoplanet is a planet outside of our Solar System.
51 Pegasi itself isn't an exoplanet, it's a Sun-like Star. But it does have an Exoplanet orbiting it, 51 Pegasi b (informally named Bellerophon.).
Both exoplanet and extrasolar planet are planets that are outside the solar sysytem.
No. A moon is not a planet. An exoplanet is aplanet that orbits a star other than the sun.
Yes. While we know relatively little about the atmospheres of individual expolanets, there is no reason an exoplanet couldn't have an exosphere.
No. The nearest exoplanet is more than four light years. We cannot travel anywhere close to that distance
We do not know enough about conditions on any exoplanet to determine if any would be suitable for humans.
The theory was published in a famous book entitled (in Latin): 'De revolutionibus orbium coelestium', which means, 'On the revolutions of the orbs of the heavens'.