Stars come in many forms, but some types are so rare that only a handful exist in our galaxy. For example, O-type stars ...

Whether the Universe will 'end' at all is not certain, but all evidence suggests it will continue being humanity's cosmic ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. A decade-long ...

A new study casts doubt on the universe’s accelerating expansion, suggesting dark energy might be weakening over time.

New research offers the most precise measurements yet of pulsating Cepheid stars, which may hold clues about the immense size and scale of our universe. Cepheids are a type of variable star that ...

A new paper published in Nature Communications could put scientists on the path to understanding one of the wildest, hottest, ...

When the roiling nuclear fusion inside of a star begins to die — gravity crushing into the star’s waning fuel-store of hydrogen atoms, fusing them into heavier helium nuclei — the universe usually ...

Researchers of the University of Granada have conducted the most complete worldwide analysis of the chemical composition and evolutionary state of a spectral type R carbon star The presence of carbon ...

A newly proposed type of supermassive black hole surrounded by a dense gas shell may account for the small red dots seen in ...

Astronomers reanalyzed the chemical composition of three stars in the Milky Way's halo and found that they are between 12 and 13 billion years old. They may have also been stolen from other galaxies.