article_snippet: planet has conditions that could support life, and is likely to be a rocky world, twice the size of Earth.
article_snippet: planet was initially discovered in 2010 (artist's impression pictured)
article_snippet: planet was initially discovered in 2010.
article_snippet: The Gliese 581d planet is likely to be a rocky world, twice the size of Earth.
article_snippet: According to one of Nasa's top planet hunters, our will find a planet with oceans like Earth in the next 15 years.
article_snippet: We hope to find a planet that's Earth-like and measure its atmosphere to work out if its has enough water on its to make an ocean,' one of Nasa's top planet hunters said in an interview with . '
article_snippet: [that star planet] has a climate that's like Earth and Its planet]
article_snippet: might have life on Its planet].' '
article_snippet: Other exoplanets have previously been doubted, most notably Alpha Centauri Bb, the closest Earth-sized world to us, which some scientists claim could just be noise in the data.
highlights_snippet: scientists say planet does exist and may provide hope for finding alien life .