Stellar Mass

X-rays Reveal a Stellar-Mass Black Hole in Andromeda

[/caption] An ultraluminous x-ray source (ULX) previously spotted in the neighboring Andromeda galaxy by NASA's Chandra observatory has now been revealed…

12 years ago

Staking Out A Vampire Star

[/caption] How do you peer into the dark heart of a vampire star? Try combining four telescopes! At ESO’s Paranal…

12 years ago