Washington, Sep 17 (DPA) A group of European astronomers said Wednesday that they had found the first known rocky planet outside the solar system.

The find by European Southern Observatory scientists in Garching, Germany, is an important step forward in answering the question of whether humans are alone in the universe, because it is the first of the more than 300 known exoplanets - as planets outside the solar system are known - that is not large and gaseous.

CoRoT-7b has a density similar to Earth. Though the small exoplanet, CoRoT-7b, resembles Earth in many ways, it is far too hot to support life, astronomers said. It's so close to its sun that surface temperatures could reach 2,000 degrees Celsius in the day and minus 200 degrees at night, said lead scientist Didier Queloz of Switzerland.

'In fact, CoRoT-7b is so close that the place may well look like Dante's Inferno,' he said.