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 The stars that 'twinkle, twinkle' in the night...

Radio Programs

Bigger and Hotter Jacking up a star’s brightness — after this. Monday, January 11, 2016
Diphda Light from a distant “frog” Friday, November 13, 2015
Pleiades III A star with a bulging waistline Wednesday, November 11, 2015
Busy Galaxy The busy, beautiful Milky Way Saturday, November 7, 2015
Stellar Death Different ways for a star to die Monday, November 2, 2015
Sheratan The hidden nature of a binary star Sunday, October 25, 2015
Mirach Stars at opposite ends of the scale Tuesday, September 29, 2015
Quick Change A star that’s changing in a hurry Saturday, August 8, 2015
Moon and Aldebaran Similar but different lights near the Moon Friday, August 7, 2015
First Stars II Brilliant clusters in the early universe Friday, July 17, 2015
The First Stars Whipping up the first stars Thursday, July 16, 2015
Stellar Metals A difference between young and old stars Wednesday, July 15, 2015
M92 An ancient family of stars Wednesday, May 13, 2015
M13 A cluster of old, faint stars Tuesday, May 12, 2015
Fast Neighbor A “runaway train” in the stars Wednesday, May 6, 2015
Alphard A long but barren constellation Monday, March 23, 2015
MY Camelopardalis A brilliant duet for the giraffe Sunday, March 15, 2015
Fewer New Stars A decline in the stellar birth rate Thursday, February 26, 2015
Bright Merger The fireworks of a hostile takeover Wednesday, February 11, 2015
Filling the Void Filling the intergalactic void Monday, January 19, 2015
Trapezium Lighting up a galactic trapeze Saturday, January 17, 2015
Sirius Rising The Dog Star climbs into winter evenings Sunday, January 4, 2015
Superflares A big outburst from a tiny star Wednesday, December 3, 2014
Rara Avis II Dancing with the firebird Sunday, November 30, 2014
Doomed Giant A big star with a brilliant future Wednesday, September 24, 2014
Biggest of the Big The monsters of the Milky Way Tuesday, September 23, 2014
Moon and Companions The little dog leads the big dog Thursday, September 18, 2014
EQ Pegasi A pair of juvenile stellar neighbors Friday, September 12, 2014
The Neighborhood Getting to know the neighbors Thursday, August 7, 2014
RECONS Taking a census of our stellar neighborhood Wednesday, August 6, 2014
Moon and Aldebaran Changing a delicate balancing act Monday, July 21, 2014
Moon and Antares Siblings that age at different rates Tuesday, July 8, 2014
Alphecca Stellar siblings with different futures Saturday, June 28, 2014
Moon and Spica Violent scenarios for a binary star Sunday, May 11, 2014
Beta Coma Berenices A star that’s a lot like our own Saturday, April 26, 2014
Runaway Stars Stars that are leaving home in a hurry Friday, April 11, 2014
Zeta Cas A star that's far above average Sunday, February 23, 2014
Moon and Aldebaran Taking the measure of the bull’s eye Friday, February 7, 2014
Life of Procyon The life of the Little Dog Star Saturday, December 28, 2013
More Aquarius A pair of yellow supergiants Sunday, December 8, 2013
Fomalhaut Surprises from a well-studied star Monday, October 14, 2013
Equuleus Two stars whose fates are intertwined Saturday, August 24, 2013
Counting Stars Counting the stars in the Milky Way Friday, July 26, 2013
Moon and Aldebaran The beginning of the end Thursday, July 4, 2013
Solar Twins A star that looks familiar Saturday, June 1, 2013
Twinkling Jewels Up-and-down stars in the northern crown Thursday, May 30, 2013
Messy Giant Kicking up dust around a giant star Friday, April 12, 2013
Gamma-2 Velorum A star exposes its inner workings Friday, April 5, 2013
Groombridge 1830 An interloper from a distant realm Sunday, March 31, 2013
Ringing Beat The beat of vibrating stars Wednesday, March 6, 2013
Moon and Antares A hot-but-cool stellar supergiant Monday, February 4, 2013
Superflares Super explosions on other stars Wednesday, January 23, 2013
Epsilon Geminorum A star by the numbers Thursday, January 17, 2013
Pollux Younger but “older” than the Sun Wednesday, January 16, 2013
Moon and Spica Giant tides on giant stars Friday, January 4, 2013
Star Populations Segregating the stars of the Milky Way Monday, December 3, 2012
Halloween Star A two-headed stellar demon Tuesday, October 30, 2012
Aries II Taking the measure of a nearby star Sunday, October 28, 2012
Alpha and Beta Aquarii Rare supergiant stars Tuesday, October 23, 2012
Arcturus Tracing a star’s origins Tuesday, August 28, 2012
M11 A flock of young stars Thursday, August 9, 2012
Spinning Hearts The spinning hearts of giant stars Thursday, August 2, 2012
Equuleus Drawing up a little horse Sunday, July 29, 2012
Moon and Scorpius Scoping out a solar twin Friday, July 27, 2012
H-R Diagram Drawing the lives of the stars Saturday, July 7, 2012
Faint But Steady Stars that are faint but long-lived Thursday, July 5, 2012
The Keystone Four stars, four stories Friday, May 25, 2012
Moon, Mars, and Regulus Different pinpoints of light Monday, April 2, 2012
Moon and Regulus Lining up a pair of stellar light bulbs Thursday, March 17, 2011
Alkaid The "leading" star of the Big Dipper Tuesday, February 22, 2011
Moon and Regulus Pinning down a moving star Thursday, February 17, 2011
Messengers The messengers of the stars Wednesday, February 2, 2011
Stellar Shock Wave A star rams its way through the galaxy Wednesday, January 5, 2011

Featured Images

Infrared image of a bow shock in front of a fast star
Shocking Star Thursday, January 7, 2016
Jets from a protostar in Serpens
Huffing and Puffing Friday, November 6, 2015
Artist's concept of Scholz's Star passing close to the solar system
Former Neighbor Thursday, May 7, 2015
M3, a globular star cluster
Reborn Stars Tuesday, March 17, 2015
Hubble Space Telescope view of V838 Monocerotis in 2006
Brilliant Echo Wednesday, February 11, 2015
Superflare on one of the stars of DG Canum Venaticorum
Tiny Star, Big Outburst Wednesday, December 3, 2014
A rare yellow hypergiant star in Centaurus
Jolly Yellow Giant Thursday, March 13, 2014
A discharge of energy from the Z Machine at Sandia National Laboratories
Zapped! Monday, February 3, 2014
The star Gamma Cas blows away gas from a nearby nebula
Star Blaster Sunday, August 18, 2013
View of the 30 Doradus star cluster and the massive binary system R144
Megastars Tuesday, July 9, 2013
Artist's concept of the Sun's structure
Powerhouse Monday, December 17, 2012
H-R Diagram
Stellar Plot Saturday, July 7, 2012
Rings and bubbles from a dying star
Jumping Through Hoops Thursday, August 5, 2010
Youthful Oldies Thursday, March 4, 2010


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