red giant stars

When the Sun Dies, Earth’s Magnetosphere won’t Provide Protection any More

The Earth’s magnetic field is an underappreciated wonder of the natural world.  It protects our atmosphere, provides some of the…

4 months ago

Measuring the Temperatures of Red Giants is Actually Pretty Tricky

Red giant stars are, well, red and giant. But astronomers have always had difficulty estimating their temperatures, due to their…

9 months ago

The Oldest Stars Help Tell us how big the Universe is

Astronomers are struggling to understand the discrepancies when measuring the expansion rate of the universe with different methods, and are…

9 months ago

A New Study Says That Betelgeuse Won’t Be Exploding Any Time Soon

I have stood under Orion The Hunter on clear evenings willing its star Betelgeuse to explode. “C'mon, blow up!” In…

9 months ago

If dark matter is a particle, it should get inside red giant stars and change the way they behave

Dark matter makes up the vast majority of matter in the universe, but we can't see it. At least, not…

1 year ago

1 in 10 Red Giants are Covered in Spots, and They Rotate Surprisingly Quickly

Sunspots are common on our Sun. These darker patches are cooler than their surroundings, and they're caused by spikes in…

1 year ago

Stars Like Our Sun Become Lithium Factories as They Die

In the beginning, the big bang created three elements: hydrogen, helium, and lithium. But it only produced a trace of…

1 year ago

It Seems Impossible, But Somehow This Planet Survived its Star’s Red Giant Phase

Astronomers working with TESS (Transiting Exoplanet Survey Satellite) data have found a planet where it shouldn't be: in the space…

2 years ago

This is the Surface of a Giant Star, 350 Times Larger Than the Sun

Using the ESO's Very Large Telescope Interferometer, an international team of astronomers has created the first detailed images of another…

4 years ago

A First: Star Caught in the Act of Devouring a Planet

How’s this for a depressing look into Earth’s potential future: astronomers have witnessed the first evidence of a planet's destruction…

9 years ago