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A dense, glowing ball of hydrogen, helium, and trace quantities of heavier elements that shines with energy released from a hydrogen thermonuclear fusion reaction in the center, or core. Our Sun is an example of a star. Stars can appear red, orange, yellow, blue, or white, according to their masses and effective temperatures. Stars are born from clouds of gas and dust, live for millions or billions of years, depending on their masses, and die sometimes spectacular deaths. Stars usually exist in very large collections called galaxies.


Cosmic Beacons May 21, 2010

Radio Programs

Asteroseismology Listening to the beat of the stars September 25, 2018

51 Ophiuchi Squishing a big star September 2, 2018

Ancient Star Looking deep into the past June 17, 2018

Solar Twin A young “twin” of the Sun June 1, 2018

Moon and Antares A stellar weight-loss plan May 29, 2018

Cor Caroli Dark blemishes on a big star April 22, 2018

More ‘O’ Stars Big stars with a big influence April 13, 2018

‘O’ Stars The showiest stars in the galaxy April 12, 2018

Procyon B Better days for a cosmic ember January 21, 2018

River’s End A star with a bulging waistline January 13, 2018

Twinkling Twinkle, twinkle, little star December 23, 2017

Rho Cassiopeia Practicing for a big blast November 22, 2017

Close Encounters A dangerous encounter with a star November 1, 2017

Moon and Companions Cranking up a giant star September 25, 2017

Moon and Aldebaran The “shifty” eye of the bull September 11, 2017

Giant Magellan Telescope II Getting to know distant planets August 10, 2017

Future Fireworks Getting ready for some fireworks June 29, 2017

Red Nova An exploding star turns red June 28, 2017

Orange Triplets Three orange stars for the price of one June 24, 2017

Messier 5 Some of the oldest stars in the galaxy June 11, 2017

Menkent An over-represented class of stars June 1, 2017

Closing In A busy, far-away source of radio waves May 23, 2017

Gienah Stirring up a star’s ingredients April 16, 2017

Seeing Orange Puffing up like orange balloons April 1, 2017

Making Elements III Heavy stars make heavy elements March 8, 2017

Making Elements II Making elements in the hearts of stars March 7, 2017

Counting Starspots Counting spots on a small star March 3, 2017