From an engineering perspective, a water tube boiler is defined by the fact that water or steam–water mixture flows inside the tubes while high-temperature flue gas passes outside the tubes. In ...

In 2014, a massive star in the Andromeda galaxy began glowing brighter in infrared light, then slowly faded from view. Nearly a decade later, astronomers say they have identified the event as the ...

In A Nutshell A massive star in the Andromeda Galaxy faded by more than 10,000 times over a decade and vanished from view, likely collapsing into a black hole without exploding as a supernova ...

In the nearby Andromeda Galaxy, a massive star bright enough to stand out for years has gone dark. Not in a blaze of glory.