Warning: This graphic requires JavaScript. Please enable JavaScript for the best experience. The Andromeda galaxy is the galaxy next door, a very faint, fuzzy thing ...

Cepheids are rare variable stars with periods ranging from about 1 to 120 days. Their light curve — a chart showing brightness over time — is characterized by rapid brightening followed by slow ...

The Hubble Space Telescope has recently captured extraordinary images of a rapidly collapsing star system in the Andromeda Galaxy. This discovery offers a unique glimpse into stellar evolution and the ...

Multi-epoch Hubble Space Telescope imaging, tracked over five to seven years, has produced the first direct measurements of ...

Hubble had been in space for less than two years when its Goddard High Resolution Spectrograph detected traces of boron in a not-too-distant star. At an estimated age of 14.5 billion years, the star ...

Over the course of human history, perhaps no single object in the night sky has drawn more attention than the Andromeda Galaxy, which the 10th-century Persian astronomer Abd al-Rahman al-Sufi dubbed a ...