article_snippet: planet was the first Earth-like planet found in the 'Goldilocks'-zone around another star.
article_snippet: Last year, Pennsylvania State University researchers said Gliese 581d - and Gliese 581d - and companion Gliese 581g - were simply a trick of the light caused by magnetic bursts from a local star 22 light-years away.
article_snippet: The existence (or not) of GJ 581d is significant because it was the first Earth-like planet discovered in the 'Goldilocks'-zone around another star and it is a benchmark case for the Doppler technique,' said lead author, Dr Guillem Anglada-Escudé. '
article_snippet: but I'm confident that GJ 581d has been in orbit around Gliese 581 all along. '
article_snippet: Pictured is an artist's impression of the planetary orbits of the Gliese 581 system compared to those of our own solar system .
article_snippet: One needs to be more careful with these kind of claims' GJ 581d is believed to be the first planet outside our solar system in the Goldilocks zone around the Goldilocks zone star – an area not too hot and not too cold for life.
article_snippet: To find Gliese 581d, University of California, Santa Cruz astronomers originally looked for subtle changes in light caused by the gravity of an orbiting planet tugging back and forth on its star –.
article_snippet: At the time, the discovery of Earth-like planets around Gliese 581 caught the public imagination.
article_snippet: Gliese 581 (the bright star shown in the centre), which is 22 light-years away, has three other confirmed planets, none of which lie within none of which habitable zone .
highlights_snippet: Gliese 581d is in star's habitable zone and may be suitable for humans .
  
highlights_snippet: Found in 2010, Gliese 581d was later dismissed as stellar bursts and not a planet .
  