it is in the pegasus constellation 51 ligight-yeaears away from our sun. did you know it was an exoplanet? >> one of the challenge is to know whether it is a planet or not is that you are very close to a v very bright stata you have to use a trick to figure thingngs out. was that youu used look at the effect the planet has on the star it is revolving around. at is theanted to look regular change in ththe star's s also the -- star' s the also the -- velelity. these changes are very minute and hard to measure. the use of instruments called spectrograraph help us down the light emitted by the star and we use the doppler effect which moves the spectro lines ever so slightly. these are the lines you get when you break down the light from the star and you use that to detect the movement and that is how we found the planet. what was a big surprise for us and everyone was that the planet that we found was completely unexpected. it was actually very closely orbiting around the star. it only takes four days to rotate and orbit a around the star. it looks very much l