The Red Moon

“I do not believe that this generation of Americans is willing to resign itself to going to bed each night by the light of a Communist moon”. -Lyndon B Johnson

A Rare Event For Astronomers And Skywatchers

The annals of European astronomy burst with famous names: Copernicus, Kepler, Halley.

Jeremiah Horrocks? Not so famous.

But in 1639, the young Englishman became the first person known to witness one of the rarest events in the heavens: the passing of Venus across the face of the sun — a transit.

On Tuesday, Venus will again cross the sun, for just the sixth time since. It won’t do so again until 2117, making this the last transit of Venus for nearly everyone alive today.

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Newly discovered planet may hold water

Astronomers on Monday announced the discovery of 50 new planets circling stars beyond the sun, including one “super-Earth” that is the right distance from its star to possibly have water.

“If we are really, really lucky, this planet could be a habitat” like Earth, said Lisa Kaltenegger of the Max Planck Institute for Astronomy in Heidelberg, Germany.

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A new planet that might support life

It might be a place that only a lichen or pond scum could love, but astronomers said Wednesday that they had found a very distant planet capable of harboring water on its surface, thus potentially making it a home for plant or animal life.

Nobody from Earth will be visiting anytime soon: The planet, which goes by the bumpy name of Gliese 581g, is orbiting a star about 20 light-years away in the constellation Libra.

But if the finding is confirmed by other astronomers, the planet, which has three to four times the mass of Earth, would be the most Earthlike planet yet discovered, and the first to meet the criteria for being potentially habitable.

“It’s been a long haul,” said Steven S. Vogt of the University of California, Santa Cruz, who, along with R. Paul Butler of the Carnegie Institution of Washington, led the team that made the discovery. “This is the first exoplanet that has the right conditions for water to exist on its surface.”

In a recent report for the National Academy of Science, astronomers declared the finding of such planets one of the major goals of this decade. NASA’s Kepler satellite — which was launched in March 2009 as a way to detect Earthlike bodies — is expected to harvest dozens or hundreds.

Gliese 581g (whose first name is pronounced GLEE-za) circles a dim red star known as Gliese 581, once every 37 days, at a distance of about 14 million miles. That is smack in the middle of the so-called Goldilocks zone, where the heat from the star is neither too cold nor too hot for water to exist in liquid form on its surface.

“This is really the first Goldilocks planet,” Dr. Butler said.

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