Its due to the way they transit around there sun.
The Hubble and Keppler space telescopes are detecting exoplanets
There are no exoplanets in our solar system. By definition, an exoplanet is a planet that is not in our solar system.
Now we know of 861 exoplanets, with several thousand awaiting confirmation
Not that we know of.
Of the exoplanets found, the vast majority are gaseous bodies.However, that does not mean the majority are. That is just the majority we have found so far.
about 403.
55 Cancri
Yes, efforts to find other planets both in and out of the solar system are ongoing. Almost two thousand have been identified outside the solar system (exoplanets), including the first strong candidates for possible planets in another galaxy. The Kepler mission space telescope continues to gather data to identify exoplanets.
Not in the lifetime of anyone alive today. With current technology, any spacecraft we launch would take hundreds of thousands of years to reach the nearest exoplanets, most of which cannot support human life.
They are called "exoplanets", if that's what you mean.
The "exoplanets" known as "Hot Jupiters".
See related link for a full list of the all "known" exoplanets
Planets that are not in the solar system are called extrasolar planets, or exoplanets.
Exoplanets refers to planets to that have been found orbiting stars other than the sun.
There are 8 planets within our solar system. They are:MercuryVenusEarthMarsJupiterSaturnUranusNeptuneOutside of our Solar System, there are possibly billions, although as of Aug 2010, only 490 exoplanets have been found - but this number is increasing almost daily.See related link for a current list of exoplanets.
Yes, with sensitive instrumentation, almost two thousand planets outside the solar system (exoplanets) have been discovered - and even the first ones in another galaxy. (Note, the human eye cannot see exoplanets unassisted).
Exoplanets are planets that are outside of the solar system. These are also referred to as extrasolar planets. Some exoplanets include Alpha Centuri B and Alpha Centuri Bb. It also includes Pluto which is no longer considered to be a planet within the solar system.