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.
No. An exoplanet is a planet outside of our Solar System.
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.
No. The nearest exoplanet is more than four light years. We cannot travel anywhere close to that distance
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'.
We won't know that until we are sure that we have discovered all of them.
There have been 95 exoplanets discovered in 2010. You'll need to be more specific on the question.
which exoplanet is 'THE exoplanet'?
The darkest exoplanet is "TRES-2B".
No. An exoplanet is a planet outside of our Solar System.
A few thousand exoplanets have been discovered so far; according to the Wikipedia article on "Exoplanet": "As of 1 March 2017, a total of 3,586 confirmed exoplanets are listed in the Extrasolar Planets Encyclopaedia".The Wikipedia article "List of exoplanets" has a list of such exoplanets.
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.).
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Radioactivity was first discovered in Paris, France. It was discovered by a French physicist by the name of Henri Becquerel.
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.
Helium was first discovered as a component of the sun before being discovered on earth. Hence the name.