The number of planets that are being found outside our own solar system is increasing as scientists improve techniques for detecting them. Astronomers have found that around 40% of stars have exoplanets in orbit around them.
Around 400 exo planets have been found so far using techniques such as looking for a gravitational woble of the star the planet is orbiting and detecting the tiny drop in radiated light as the planet passes through the line of sight between the Earth and the host star.

The ultimate goal of this research would be to find an exoplanet that was orbiting star at a radius in the so called Goldielocks zone, where the surface temperature is not too hot or too cold, has the conditions for life to start.

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