Stellar Evolution

Just 2,000 Years Ago, Betelgeuse Was Yellow, Not Red

Compared to the lifespan of stars, human lives are pretty short. Stars such as Betelgeuse (in Orion) live for millions…

6 months ago

Astronomers Find the Oldest Planetary Nebula

Planetary nebulae are short-lived "leftovers" of sun-like stars. Most of these "star ghosts" only last—at most—about 25,000 years. Usually, their…

7 months ago

In Wildly Different Environments, Stars End Up Roughly the Same

When you look at a region of the sky where stars are born, you see a cloud of gas and…

7 months ago

Thanks to Gaia we Know Exactly how and When the Sun Will die

Observations from the Gaia spacecraft gives us a detailed picture of how the Sun will live and die.

7 months ago

A Dormant Black Hole has Been Discovered Just Outside the Milky Way

What happens when a massive star dies? Conventional wisdom (and observational evidence) say that it can collapse to form a…

8 months ago

Red Supergiant Stars Bubble and Froth so Much That Their Position in the Sky Seems to Dance Around

Making a 3D map of our galaxy would be easier if some stars behaved long enough to get good distances…

9 months ago

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,…

9 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…

11 months ago

A Second Generation of Planets can Form Around a Dying Star

When young stars coalesce out of a cloud of molecular hydrogen, a disk of leftover material called a protoplanetary disk…

1 year ago

Astronomers Watch a Star Die and Then Explode as a Supernova

It's another first for astronomy. For the first time, a team of astronomers have imaged in real-time as a red…

1 year ago