It feels perfect for these PG times. But though it may be the best of the Smurfs movies, it still puts the innocuous in ...

What could we choose as the seven most remarkable celestial objects visible either with our eyes or with a small telescope?

Look up at the night sky, and you’ll find stars of many colors, red dwarfs, yellow suns, blue giants… but no green stars. Why? In a universe filled with billions of stars, why doesn’t a ...

However, the observable universe extends farther than 13.8 billion light-years in every direction because, for all the time space has existed, it’s also been expanding.

However, the observable universe extends farther than 13.8 billion light-years in every direction because, for all the time space has existed, it’s also been expanding.