NASA astronaut Nichole Ayers photographed a rare atmospheric phenomenon over the US and Mexico known as a "sprite" that's associated with lightning.

Discover why Earth's farthest distance from the sun coincides with summer heat, then grab your binoculars for a week of ...

Here’s a look at the first moon landing on July 20, 1969. The moon landing was watched by an estimated 600 million people around the world. Facts July 20, 1969 – [4:17 p.m. EDT] Apollo 11 becomes the ...

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For one, scientists observe a "cosmic fossil" called the cosmic microwave background (CMB). The first light that was free to ...

Earth and our entire Milky Way galaxy may sit inside a mysterious giant hole which makes the cosmos expand faster here than in neighboring regions of the universe, astronomers say.

Astronomers claim to have found new evidence supporting a controversial observation that our galaxy is residing in an ...