Boozers were decked with purple balloons and flags; murals were everywhere you looked; people donned Ozzy outfits, flooding ...

The Sun, our life-giving star, is slowly dying. In about 5 billion years, it will exhaust its fuel and transform into a red giant, altering the solar system forever. But long before that, the Sun’s ...

Data from oceans, ice and the air all point to the same thing: rising invisible heat. What experiments are working, and what kinds of trials do we need to stop?

NASA astronaut Nichole Ayers captured an electrifying image of a giant lightning "sprite" shooting up over Mexico and ...

Scientists say that the construction of a vast new radio telescope array in the Utah desert — known as the Deep Synoptic ...

Even if Earth does survive, it won’t be pretty. The temperature of our planet will be about 1,300 degrees C, hot enough to ...

As summer settles in and temperatures climb in the Northern Hemisphere, it’s impossible to forget just how much the sun ...

How frequently does a traveler from another star system sweep through our galactic neighborhood, and astronomers rush to the telescope? Not until recently was the answer: hardly ever. In fewer than ...

Celebrate the Fourth with the Fireworks Galaxy, then check out the Demon Star Algol and the Full Buck Moon in the sky this ...

The "new stars" are best seen from the Southern Hemisphere, but people have spotted them from the United States by looking ...

Officially named 3I/ATLAS, the comet was confirmed as having originated outside of Earth's solar system on July 3, according ...

NASA has discovered an interstellar comet that's wandered into our backyard. The space agency spotted the object with the ...