A seal hunter bloodies the waters, models strut the world's longest catwalk, mourners remember Hiroshima, and more in this week's best news photos.

With a massive mirror 34 feet wide, the newly inaugurated Gran Telescopio Canarias in the Canary Islands is the largest optical observatory on Earth ... although it might not hold that title for long.

Just as Hercules had the multi-headed hydra to contend with, ocean predators tussle with two-headed sea snakes—or so it appears.

Once Earth's fourth largest lake, the Aral Sea has shrunk substantially, with its eastern section losing about 80 percent of its water between 2006 and 2009, new satellite images show.

See a possible meteorite on Mars, a space shuttle on an electric morning, an astronaut's-eye view of dusk on Earth, and more in the week's best space pictures.

A new dink frog discovered in southern Costa Rica sports different colors depending on its age and sex—a rare trait among frogs, a new study says.

Denture wearers take note: Science is one step closer to growing replacement teeth. For the first time an honest-to-goodness tooth has grown from stem cells in a jaw.

Using aerial pictures of crop fields near Venice, researchers have made a detailed map of the buried Roman port of Altinum, revealing the remains of city walls, a network of streets and canals, homes, and even monuments such as an amphitheater and a basilica.

An Irish snorkeler gets bogged down, a Japanese polar bear takes a plunge, a bridge collapses in quake-ravaged China, and more in this week's best news photos.

Despite the slight mohawk, the bare-faced bulbul is the first known bald songbird in mainland Asia, conservationists say.

Jellyfish that can grow up to 6.5 feet wide and weigh 440 pounds are poised to invade Japan. They are Nomura's jellyfish, and scientists and fishers who recall the last major inundation in 2005 are bracing themselves for the next potential wave.

The country's first ever nationwide tiger survey is a heartening sign for the Bengal tiger, which has dropped severely in number throughout its Asian habitat, conservationists say.

Plucked from millions of images by a "Peas Corps" of volunteers, the tiny, round, green galaxies are forming stars at an exceptional rate, astronomers have announced.

Stare into space and it might stare back. This week's best pictures include a galactic "eye," an ocean-size cloud on Jupiter, rare angles on an eclipse, and more.

Rats with spinal cord injuries recovered motor function after being injected with a blue food-coloring derivative--possibly opening the door to the first major treatment for human spinal-trauma patients, a new study says.