Nobody?s ever seen Mercury in such detail, or color. The first images of the planet in 30 years provide rich close-ups of ridges, cliffs and compound crater formations, all in high-resolution color.

It’s a world where the Sun stops in the sky at noon and spins a small circle. Where you’d celebrate your annual birthday twice every day. In places, it’s as cold as the temperature of liquid air; ...

Mercury, the speedy little planet closest to the sun, is making a special twilight appearance this month as a bright pink dot low in the sky. The show started on Feb. 8 and will continue until Feb. 21 ...