By 3.6 billion years ago, Mars should have become too cold for liquid water, but something kept the rivers flowing.

New research suggests that about 3.6 billion years ago, Mars featured vast water flows and a lake rivaling the size of the ...

On a cold, ancient Mars, rivers flowed and a lake the size of the Mediterranean Sea swelled under the protection of thick ice ...

Warming temperatures may be changing the ways ice forms, making it more likely to stick to and injure polar bears in two far ...

The persistent reduction in polar ice contributes to broader ecological changes and heightened ... This is because while bright sea ice reflects most of the Sun’s energy back to space, open ocean ...

have been endurance training for the Ice Kilometre swim for months. "There's no wetsuit, there's no lard, there's no grease. It's just you against the perishingly cold water," Ms Fleury said.

which would help thaw and dislodge the ice chunks because the water is warmer than the air temperature. Researchers have studied the population of polar bears since the 1990s and have never seen ...

The heavy polar bears break through the ice crust, injuring their paws on its sharp edges ... which would help thaw and dislodge any accumulated ice from their feet, due to the warmer water ...

They have a thick layer of body fat and a water-repellent coat that insulates them from ... seals because they need large amounts of fat to survive. Polar bears rely heavily on sea ice for traveling, ...

In a study that has provided clues about how polar bear disease could be linked to ice loss, scientists examined blood samples from bears in the Chukchi Sea - between Alaska and Russia.