Hopes dashed for life on distant planet

A stable star
Matthews own research, recently presented at the annual meeting of the Canadian Astronomical Society, suggests one reason Gliese 581 is such a promising star for finding habitable planets is that it is similar to our own sun in that it is remarkably stable.

Matthews and his team used a Canadian space telescope called MOST to monitor Gliese 581 for six weeks. During that time, they observed very few instances of the powerful solar flares common among red dwarf stars.

"If the star showed significant variations in brightness during the weeks we monitored it, that would at least complicate the thermal equilibrium of the planets around it," Matthews explained.

The stability of the light also suggests Gliese 581 is old and that is has been around for at least a few billion years.

"Young stars, like young people, can have bad cases of acne (large starspots and activity) and spin around," Matthews said in an email interview. "Older stars like the sun have relatively clear complexions and rotate rather sedately."

Gliese 581's advanced age is good news for scientists hoping to find signs of life in the system.

"We know it took about three and a half billion years for life on Earth to reach the level of complexity that we call human," Matthews said, "so it's more encouraging for the prospects of complex life on any planet around Gliese 581 if it's been around for at least as long."

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