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Space

Vesta, Brightest Asteroid, Now High Overhead

Vesta is at opposition, shining at 6th magnitude in Gemini as it awaits your binoculars or small scope. The first asteroid discovered, 1 Ceres, is still the biggest. But it's not the brightest. That honor goes to 4 Vesta, at least during

Mud Cracks on Mars Suggest a Watery Ancient Past

A Martian rock slab called "Old Soaker" on Mount Sharp has a network of cracks that might have formed from a mud layer that dried more than 3 billion years ago. This image was taken by the Mast Camera (Mastcam) on NASA's Curiosity rover on…