Here's when to see a pair of massive letters shining on the lunar surface around May's first quarter moon phase.

Tonight marks the First Quarter Moon, when roughly half of the Moon’s visible face is illuminated. As of Saturday, May 23, ...

Long before the full moon rises, shifting sunlight transforms the lunar surface into one of the sky's best telescope targets.

The final mission before the landmark Apollo 11, Apollo 10 served as a dress rehearsal, testing every aspect of the Moon landing except for the actual landing itself. On May 18, the crew of Commander ...

The phenomenon of a Full Moon arises when our planet, Earth, is precisely sandwiched between the Sun and the Moon. This ...

Venus and Jupiter remain visible in the evening sky soon after sunset early in July, although Jupiter fairly quickly drops ...

The Moon is drifting away from Earth, a tiny shift that scientists can measure with remarkable precision. This slow drift ...