Wednesday, October 2, 2013
Robert Frost’s classic 1923 poem ”Nothing Golden Can Stay” is certainly true for planets that are in the habitable zone — or shall we say the golden zone — around their parent stars. A planet’s lease on life runs out when the evolving star grows too hot for the world hold onto water for sustaining life as we know it. With increasing stellar luminosity, the habitable zone sweeps outward beyond the planet’s orbital radius, leaving paradise worlds to bake to death as surviving extremophliles burrow underground. What’s sobering is that Earth has already spent 70 percent of its habitable years inside the sun’s golden zone. And it took that long for intelligent life to appear on the surface.
See complete article at Discovery.com - click link below........
Posted by Atrueoriginall at 6:28 PM
Saturday, June 1, 2013
Friday, February 8, 2013
By: Mike Wall
Published: 02/06/2013 11:10 AM EST on SPACE.com
Billions of Earth-like alien planets likely reside in our Milky Way galaxy, and the nearest such world may be just a stone's throw away in the cosmic scheme of things, a new study reports.
Astronomers have calculated that 6 percent of the galaxy's 75 billion or so red dwarfs — stars smaller and dimmer than the Earth's own sun — probably host habitable, roughly Earth-size planets. That works out to at least 4.5 billion such "alien Earths," the closest of which might be found a mere dozen light-years away, researchers said.
"We thought we would have to search vast distances to find an Earth-like planet," study lead author Courtney Dressing, of the Harvard-Smithsonian Center for Astrophysics (CfA), said in a statement. "Now we realize another Earth is probably in our own backyard, waiting to be spotted."
Read the entire article here .....
Also see ....
9 Exoplanets That Could Host Alien Life
Posted by Atrueoriginall at 4:32 AM