As NASA prepares to return to the moon, studying astronaut health and safety is a top priority. Scientists monitor and ...

The annual Lyrid meteor shower is back, offering people across the Northern Hemisphere a chance to catch shooting stars in ...

When a new comet appears in the sky, there is often excitement. But things don’t always end well for the ancient celestial objects, made of ice, frozen gases and rock, as they near the sun — and an ...

The photo of a 9.5-light-year-long cloud within the Eagle Nebula celebrates the space telescope’s upcoming 35th birthday.