valleys

No planet comes close to the life-giving properties of planet Earth — at least not yet

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With the discovery of more than 5,600 planets orbiting other stars and images from robots we have sent to all the planets in our solar system, it is becoming abundantly clear that Earth is unique among worlds. Almost all of the exoplanets scientists have discovered since the 1990s fall into four main types: gas giants like Jupiter … Read more

New study investigates threat of ‘watermelon snow’ to mountain glaciers

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The Rocky Mountains conjure up images of grey rugged peaks capped with white. But within the upper reaches of the harsh mountain landscapes, a rosier hue often blooms. Watermelon snow, also known as glacial blood, is caused by algae that turns the snow a startling shade of red. The algae blooms in summer, forming on … Read more