Word of the day Syzygy explains a scientific term used in astronomy. It describes a straight-line arrangement of celestial ...

It’s easy to forget that stars, just like us, have lifetimes. They’re born, they live, and eventually, they die. And for some stars, their death is dramatic, producing an explosion so powerful it can ...

This article (originally published Aug. 13, 2025) has been updated to include new text and illustrations featured in the Jan.

Edwin Hubble, born November 20, 1889, made seminal observations in 1923 of the Andromeda Galaxy and a Cepheid variable, which significantly broadened the understanding of other galaxies and the ...