A really big asteroid is about to pass Earth | | Biggest near-Earth object to pass this close since this category of objects was discovered over a century ago. Might be visible in binoculars, plus links to online viewing here. | | |
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Hidden river once flowed under Antarctica | | "Ice, by itself, is only capable of flowing at velocities of no more than tens of meters per year. That means the ice is being helped along. It’s sliding on water or mud or both." | | |
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Tonight … Orion and Sirius the Dog Star | | Have you noticed a very bright, madly twinkling star before dawn? Many do, at this time of year. That star is Sirius. It’s low in the east before the sun comes up, shining with glints of red and flashes of blue. Very easy to see! | | |