A newly-discovered alien planet seven times bigger than Earth may be able to support life, astronomers wrote in a study appearing in the journal "Astronomy and Astrophysics."

The planet, dubbed HD 40307g, is one of only a few to be discovered in the "habitable zone": a sweet spot, neither too close or too far from its sun, where liquid water could exist.

An American regarded as a father of computer graphics, an Indian literary critic and a Japanese molecular cell biologist have received the Kyoto Prize, Japan's highest private award for global achievement.

The Inamori Foundation awarded its advanced technology prize on Saturday to U.S. computer scientist Ivan Sutherland, who developed the graphic interface program Sketchpad in 1963.

Scientists said Wednesday they have developed a method to "see through" layers of thin, solid material in a breakthrough that holds promise for medical imaging, nanotechnology -- and the spy trade.

Still in its infancy, the technique using laser and computer decoding has allowed a team from the Netherlands and Italy to "see" an object behind a non-see-through barrier made of ground glass.

New Zealand's government said Friday that it would not sign on for a second stage of the Kyoto Protocol climate treaty, a stance that angered environmentalists and political opponents.

The announcement came the same day that Australia said it would stay the course and commit to "Kyoto 2."

Fishing nations meet in Morocco next week to thrash out tuna quotas as experts urge maintaining bluefin catch limits amid promising signs of the decimated species making a comeback.

Hunted to the brink of extinction to feed a burgeoning sushi market, the Atlantic bluefin tuna was placed on the endangered list of the International Union for the Conservation of Nature (IUCN).

Affordable fuel from grasses, trees and plant waste that packs enough of a punch to power a plane? Scientists said Wednesday this can be done using chemistry to boost basic fermentation processes.

A team at the University of California in Berkeley said it had developed a method to add carbon atoms to biofuels obtained from fermentation -- currently not potent enough to replace gasoline, jet fuel or diesel.

Paleontologists said Wednesday they have found small blades in a South African cave proving that Man was an advanced thinker making stone tools 71,000 years ago -- millennia earlier than thought.

The find suggests early humans from Africa had a capacity for complex thought and weapons production that gave them a distinct evolutionary advantage over Neanderthals, say the authors of a study published in Nature.

Researchers from Australia and Saudi Arabia launched a project Thursday which they hope will help them understand the genetic makeup of corals and how they react to climate change.

Reefs around the world are under threat from bleaching due to climate change, as well as storms and predatory starfish, and scientists want to learn more about coral resilience to help head off further destruction.

The remote Pacific islands of Tokelau have become the first territory in the world to generate their electricity entirely from solar energy, in a project hailed as an environmental milestone.

Before the solar power grid was completed, the New Zealand-administered grouping of three coral atolls, with a population of just 1,500, relied on diesel generators for electricity.

A near-complete skeleton of a mammoth which lived between 200,000 and 500,000 years ago has been found near Paris, the French National Institute for Preventive Archaeological Research said Tuesday.

The remains were discovered at Changis-sur-Marne, northeast of Paris. They included a femur, a complete pelvis, jawbones and four connected vertebrae.