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'''Extrasolar planets''' or '''exoplanets''' are planets that orbit stars other than the sun.   

'''Extrasolar planets''', or '''exoplanets''', are planets that orbit stars other than the sun.   

Planets have no light source of their own, and most extrasolar planets are too far away to be seen by the light they reflect from their own suns, however some have been detected by the methods described below.

Planets have no light source of their own, and most extrasolar planets are too far away to be seen by the light they reflect from their own suns; however, some have been detected by the methods described below.

== Methods of detection ==

== Methods of detection ==

=== Radial velocity ===

=== Radial velocity ===

Instead of mapping the position of the star against the background, it is also possible to detect the minute [[Doppler-shift]] in the star's spectrum as it is tugged by the planet.  This method is responsible for the majority of extrasolar planet detection.

Instead of mapping the position of the star against the background, it is also possible to detect the minute [[Doppler shift]] in the star's spectrum as it is tugged by the planet.  This method is responsible for the majority of extrasolar planet detection.

=== Transit method ===

=== Transit method ===