Mercury will be hovering just above the horizon—and a little further to the left, roughly between the two planets. The crescent moon will complete a celestial smiley face for the ages.

In reality, two planets will be hanging out very close to the moon on April 25, but they won’t form a smiley face. Venus and ...

I pick out North America’s celestial highlights for the weekend ahead (which also applies to northern hemisphere mid-northern ...

Mars didn't lose all its water without a fight. The planet, today 1,000 times drier than the driest desert on Earth, gradually lost its insulating atmosphere. The Red Planet's once great Martian ...

A 'smiley face' has been discovered on the surface of Mars and scientists say this could show indicators of life on the planet. It can only be seen using infrared technology but it is the remnant ...