red giant stars

Astronomers Caught Betelgeuse Just Before it Started Dimming and Might Have Seen a Pressure Wave Rippling Through its Atmosphere

A couple of years ago, Betelgeuse generated much interest when it started dimming. That caught the attention of astronomers worldwide,…

3 months ago

Slimmed Down Red Giants Had Their Mass Stolen By a Companion Star

Millions of stars that can grow up to 620 million miles in diameter, known as 'red giants,' exist in our…

5 months ago

Dying Star Puffs out six Smoke Rings

A red giant star is dying in an unusual way by blowing smoke rings before its eminent demise.

6 months ago

Giant Stars and the Ultimate Fate of the Sun

Astronomers have a new tool to help them understand giant stars. It's a detailed study of the precise temperatures and…

10 months ago

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…

1 year 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…

2 years 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…

2 years 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…

2 years 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…

2 years 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…

2 years ago