Earth’s sister planet reaches greatest western elongation and dichotomy as the waxing Moon slides along the ecliptic in the ...

A dazzling cosmic swirl, NGC 3507 shines alone in this Hubble image, though it secretly belongs to a dynamic galactic duo.

Around the world, advocates are fighting to preserve dark skies, as a vital asset for humankind. But there’s also new ...

Using the scientific precision of terms like “IF Type IIa”— to describe diamonds so pure they show no inclusions under 10x magnification — jewelry purveyors have long placed heavy emphasis on the ...

Astronomers have discovered a strange new object in our Milky Way galaxy. The celestial object is emitting X-rays around the ...

Conditions have to be just right for noctilucent clouds to be visible. They tend to only appear during the twilight hours, ...