White dwarf

Supernovae usually appear suddenly in the sky, but now astronomers have spotted one in advance. The telltale sign is a star with a “teardrop” shape, as it gets stretched out by the gravitational pull of a companion.

Astronomers have discovered the smallest but most massive white dwarf ever found. The tiny star is only the size of our Moon, but packs in more mass than the Sun, meaning it’s approaching the theoretical limit of what’s possible without exploding.

Astronomers have used computer modeling to reveal the chaotic fate of a distant solar system in which the planets orbit in near perfect synchronization, and in the process shed light on how ancient white dwarfs become polluted with debris.

Astronomers have identified the remains of a rare type of supernova in our home galaxy for the first time. These events, known as Type Iax supernovae, occur when white dwarfs explode and may leave behind a “zombie star.”

NASA has discovered a strange star system where a gas giant planet is tightly orbiting a tiny white dwarf. This the first sighting of such an arrangement, raising questions about how the planet survived the star’s expansive death in the first place.

The universe will most likely end by slowly fading to black over trillions of years. Now a theoretical physicist has calculated the last interesting event that will ever happen: the explosions of stars called black dwarfs, which don’t even exist yet.

A supernova may seem like a pretty final fate, but now astronomers have discovered a star that apparently survived this explosive process. It wasn’t without consequence, however – the star was kicked out of a binary orbit and flung across the galaxy.

Scientists have discovered a massive planet evaporating as it orbits the remains of a Sun-like star. This is the first time evidence of a huge planet orbiting a white dwarf has been observed, and it could help reveal the fate of our own solar system.

White dwarf stars are thought to follow very specific “rules” – if they’re over a certain mass limit, they’ll explode in a supernova with a very predictable brightness and time. But now Caltech astronomers have found a strange twist: white dwarfs used to explode at lower masses than they do today.

Human lives make it impossible to witness the full life cycles of stars, planets and galaxies. But sometimes, if we’re lucky, astronomers might be able to catch crucial moments playing out before their eyes. Now a team has done just that, watching as a red giant star goes through its death throes.

NASA’s Transiting Exoplanet Survey Satellite was built to search for new planets, but astronomers at Ohio State found it could also observe supernovas created by exploding white dwarf stars. This means we might soon have a better idea about why they explode, and what they leave behind.

The cosmos is full of strange things, like planets made of diamond, mysterious radio bursts and quasars that shine like 600 trillion Suns. Now astronomers have spotted a bizarre star that may prove to be one of the rarest objects ever, with maybe as few as five or six of them in the galaxy.