The trailblazing Harvard scientist, who documented the dominance of hydrogen and helium in stars, is still inspiring ...

Astronomers are racing to protect the dark skies as private companies seek to place large advertisements in Earth orbit ...

NEW YORK (AP) — A European space telescope launched to explore the dark universe has released a trove of new data on distant ...

For decades, astronomers have classified exoplanets into neat categories: rocky Earth-like planets, gas giants like Jupiter, ...