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Extrasolar Planets The universe is composed of many galaxies, planets, an abundant amount of stars, and matter. There are different types of planets and one of the types is extrasolar. An extrasolar planet is a planet around other stars, and these planets are Mercury, Venus, Earth and Mars. One can see these planets through powerful telescopes. A technique used to search for a planet is by watching for small gravitational tugs that it exerts on its star, which can measure a star’s velocity. The Doppler-shift method had been used to identify more than fifty planets around stars. Some recent discoveries are a “planetary system” orbiting the star “Upsilon Andromedae, and of three planets; the smallest would