Gemstones like precious opal are beautiful to look at and deceivingly complex. As you look at such gems from different angles ...

Learn how to spot Sirius, Procyon and their canine constellations, and discover the myths and science behind the dog stars.

Scientists have discovered over 6,000 planets that orbit stars other than our sun, known as exoplanets. More than half of ...

Over the years, passing spacecraft have observed mystifying weather patterns at the poles of Jupiter and Saturn. The two ...