Planets | featured news

Aliens could conceivably live on planets illuminated by the swirling mass of photons orbiting the singularity of a special type of black hole, according to a new theory.

For the first time, Earth has a regular orbiting eye-in-the-sky spying on the solar system's smallest and strangest planet, Mercury.

Scientists have estimated the first cosmic census of planets in our galaxy and the numbers are astronomical: at least 50 billion planets in the ...

The crew of a simulated international Mars mission took their first steps on an indoor Red Planet landscape on Monday, marking the halfway point in an ambitious 520-day isolation experiment to test the strains of interplanetary travel.

NASA's next-generation rover mission to the surface of Mars needs more money – again. Nine months before the scheduled launch, the space agency says the mission has burned through its reserves and needs another $82 million to complete testing before liftoff.

Some researchers now question last year's discovery of a planet outside our solar system, in a so-called "habitable" zone not too hot for liquid ...

Towards the end of 2011 a large and hugely expensive robotic rover called Curiosity is due to blast off for Mars from Cape Canaveral. If it makes it safely to the planet’s surface in August 2012 one of the first things it will do is sniff the air. Its creators, back on Earth, will be straining to see if that air carries a whiff of methane.

Scientists said Tuesday they have found the best evidence yet of ice volcanoes on Saturn's giant moon Titan. Unlike volcanoes on Earth, such ...

A Japanese probe reached Venus on Tuesday and prepared to enter orbit on a two-year mission that would mark a major milestone for Japan's space program and could shed light on the climate of Earth's mysterious neighbor....

But Dr. Brown has a unique distinction: He was, for a few hours in 2005, the only person on Planet Earth to know that the standard nine-planet solar system model was going to require rejiggering. He had just discovered a 10th potential planet, but he had also come to see that neither Pluto nor this new heavenly body (first nicknamed Xena, then officially named Eris) really measured up to the other eight.