European astronomers have reported they had detected a planet orbiting the closest star to the Sun. This planet has a similar mass to Earth. The observation breaks new ground in the hunt for exoplanets, worlds that exist in other solar systems. This discovered planet itself is not "another Earth" as it is located in a scorchingly hot zone though. The find was made thanks to a telltale wobble in the star's motion, tugged by the gravitational pull of the passing planet. The transiting planet makes the star move back and forth, in relation to Earth.