First possible extrasolar terrestrial planet detected only twenty light-years away!

Bad Astronomy -- But it gets far, far better. The parent star, Gliese 581, is a red dwarf, meaning it’s smaller and cooler than the Sun. The as-yet unnamed planet orbits this star much closer than the Earth does the Sun; it stays about 11 million kilometers (6.7 million miles) from its star, while the Earth is 150 million km (93 million miles) from the Sun. ...so at this distance the planet would actually be very temperate: models show it would be between 0 and 40 Celsius! ... That is warm enough for water to be a liquid.

In this artist’s conception courtesy of our own Karen Wehrstein (Much greater resolution here) the sun would never move as seen from the surface of a tidally locked world, but the sky is an ever-changing show greater than any on earth. Observational data and theoretical models suggest that stars like Gliese 581 might have a dynamic, granular surface and sport enormous starspots. It could be engulfed in perpetual solar storms, seen here as faint plasma arcs and visible surface flares. The star is shown as it might appear above a hypothetical waterworld’s horizon from just sunward of the terminator, distorted and dimmed through a blanket of CO2 five times thicker than our own atmosphere. With less than 7 million miles separating star and planet, Gliese’s solar wind easily plows through the planet’s (presumed) weak magnetic field and slams into the upper atmosphere to produce brilliant displays. Shimmering cascades of what on earth might be called colorful sprites, blue jets, and dazzling aurora mingle so completely with high, wispy clouds as to be virtually indistinguishable. Fat cumulous clouds hang low over the water eerily backlit by the brooding red-dwarf. One lone iceberg represents the assumed many which calve off from the great unseen ice-sheet dominating the planet’s dark side and drift slowly to their eventual destruction on global currents through a deep, planetary ocean of carbonated water. High overhead the barest hint of shorter wavelengths are scattered by the thick air, coloring the zenith a deep twilight blue. Could life evolve in such an alien environment?