stellar evolution

Stars Boil Before They Blow Up, Says NuSTAR

by Jason Major February 19, 2014

Want to stay on top of all the space news? Follow @universetoday on Twitter Supernovas are some of the most energetic and powerful events in the observable Universe. Briefly outshining entire galaxies, they are the final, dying  outbursts of stars several times more massive than our Sun. And while we know supernovas are responsible for […]

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Is Eta Carinae Heading Toward Another Eruption?

by Shannon Hall February 19, 2014

Massive stars can devastate their surroundings, unleashing hot winds and blasting radiation. With a mass over 100 times heavier than the Sun and a luminosity a million times brighter than the Sun, Eta Carinae clocks in as one of the biggest and brightest stars in our galaxy. The enigmatic object walks a thin line between […]

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Dazzling New Views of a Familiar Cluster

by David Dickinson February 19, 2014

Wow. It’s always amazing to get new views of familiar sky targets. And you always know that a “feast for the eyes” is in store when astronomers turn a world-class instrument towards a familiar celestial object. Such an image was released this morning from the European Southern Observatory (ESO). Astronomers turned ESO’s 2.2-metre telescope towards […]

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When Is a Star Not a Star?

by Jason Major December 13, 2013

When it’s a brown dwarf — but where do we draw the line? Often called “failed stars,” brown dwarfs are curious cosmic creatures. They’re kind of like swollen, super-dense Jupiters, containing huge amounts of matter yet not quite enough to begin fusing hydrogen in their cores. Still, there has to be some sort of specific […]

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Nearby Ancient Star is Almost as Old as the Universe

by Dan Majaess February 23, 2013

A metal-poor star located merely 190 light-years from the Sun is 14.46+-0.80 billion years old, which implies that the star is nearly as old as the Universe!  Those results emerged from a new study led by Howard Bond.  Such metal-poor stars are (super) important to astronomers because they set an independent lower limit for the age […]

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