A planet that orbits around a star other than the Sun.


Facts and Figures The biggest, farthest and fastest in the...
Finding Earth-Like Planets Astronomers have discovered far more planets...
Exoplanets As the list of known planets beyond the solar...
Aquarius Thanks to its position in the zodiac, not to...
Cancer, the Crab Although it is one of the constellations of the...
Libra, the Scales Libra represents a balance scale. The name may...

Radio Programs

Tau Ceti Visiting a dusty star system — after this. Monday, January 4, 2016
Planet Land A place to look for lots of planets Thursday, November 19, 2015
Moon and Spica Keeping away from a bright pair of stars Sunday, November 8, 2015
Moon and Aldebaran Patiently watching the bull’s eye Thursday, October 29, 2015
Tau Ceti De-populating a popular star system Wednesday, October 14, 2015
Hot Planet A world you wouldn’t want to visit Tuesday, October 13, 2015
51 Pegasi A puffy planet gets some attention Monday, October 12, 2015
Fomalhaut Grinding up some “dusty” comets Monday, September 21, 2015
Alpha Centauri Planet Taking the measure of a planet Saturday, September 12, 2015
Proxima Centauri Planets Planet searches come up empty Friday, September 11, 2015
Hunting Planets IV Patiently looking for planets Saturday, August 29, 2015
Hunting Planets III Looking for big, cold planets Friday, August 28, 2015
Hunting Planets II More nights hunting for planets Thursday, August 27, 2015
Hunting Planets Getting ready to hunt planets Wednesday, August 26, 2015
Doomed Planets Planets with limited lifetimes Friday, June 12, 2015
Day and Night Day and night on distant planets Thursday, June 11, 2015
Living in Circles The intelligent choice for planetary systems Wednesday, June 10, 2015
Exoplanets An astounding variety of planets Tuesday, June 9, 2015
Moon and Jupiter Jupiter loses its status Saturday, May 23, 2015
Saturn at Opposition III Drawing rings around a giant planet Wednesday, May 20, 2015
The Search Continues The search for planets continues Monday, April 13, 2015
Denebola The “dusty” tail of the lion Tuesday, March 31, 2015
Seeing the Past Looking at the solar system’s past Sunday, March 1, 2015
Binary Planets Two planets for the price of one Tuesday, January 20, 2015
Hot Weather Hot weather on a distant planet Friday, December 26, 2014
More Rigel Clearing space around a giant star Tuesday, December 23, 2014
Smash-up! A smash-up in a distant star system Thursday, December 4, 2014
Fast Day A planet that spins in a hurry Tuesday, December 2, 2014
New Names Spicing up the names of distant worlds Monday, October 20, 2014
Fomalhaut III Taking a look at a possible “dusty” planet Friday, October 3, 2014
Fomalhaut Watching one of the “guardians of heaven” Wednesday, October 1, 2014
Doomed Planets Doomed planets around a dying star Sunday, August 24, 2014
Planet Bonanza A plenitude of exoplanets Saturday, August 23, 2014
New Searches Taking a closer look at exoplanets Friday, August 8, 2014
Distant Planets IV Young planets on the move Thursday, May 1, 2014
Distant Planets III A giant planet near the head of the water snake Wednesday, April 30, 2014
Distant Planets II A patient search for distant planets Tuesday, April 29, 2014
Distant Planets Looking for hard-to-find planets Monday, April 28, 2014
61 Virginis Some nearby planetary neighbors Friday, April 25, 2014
In-Between Planets Super-Earths and mini-Neptunes Tuesday, March 4, 2014
Kepler A space telescope piles up the planets Monday, March 3, 2014
Pollux A “wobbly” planetary discovery Sunday, March 2, 2014
Earths Galore Earth-like planets by the millions Saturday, February 22, 2014
Blue-Hot Planet A visit to another blue planet Monday, December 2, 2013
More Fomalhaut A giant planet of mystery Tuesday, October 15, 2013
Moon and Jupiter Looking for a giant planet Saturday, September 28, 2013
Spitzer Space Telescope Taking a good look at an exoplanet Friday, August 23, 2013
HAT P-7 Cooling off a distant star Friday, August 16, 2013
Toasted Planets Toasting planets from the inside out Thursday, August 15, 2013
M4 An ancient city of stars Sunday, August 4, 2013
Dusty Vega Stirring up dust around a bright star Friday, June 14, 2013
Solar Twins II Hunting for worlds like Earth Sunday, June 2, 2013
Alpha Centauri Planet A nearby planetary neighbor Sunday, April 21, 2013
Tau Boötis Keeping an eye on a star with a planet Sunday, April 7, 2013
Pulsar Planets Reborn from a violent demise Tuesday, March 12, 2013
Planetary Debris Rocky evidence of planetary systems Monday, March 11, 2013
In the Zone Comfortable worlds around feeble stars Sunday, March 10, 2013
Lots of Planets Strength of discovery in numbers Saturday, March 9, 2013
Four Suns A world with four suns in the sky Friday, March 8, 2013
Planet Hunters Hunting for leftover planets Thursday, March 7, 2013
Side Jobs A space telescope gets some extra jobs Tuesday, March 5, 2013
Hot Planet The glow of a small but hot planet Thursday, January 24, 2013
Moon and Jupiter Tiny planets around a tiny star Sunday, March 25, 2012
Bigger Diamonds Real astronomical “sparklers” Friday, January 11, 2013
Sweet Discovery A “sweet” discovery at a distant star Wednesday, November 14, 2012
White-Dwarf Planets II Dead stars consume dead planets Wednesday, October 17, 2012
White-Dwarf Planets Close planets around dead stars Tuesday, October 16, 2012
More Fomalhaut Cometary chaos around a young star Tuesday, September 18, 2012
Fomalhaut The lonely “Autumn Star” Monday, September 17, 2012
Hot Jupiters Clearing out a star system Saturday, September 15, 2012
Gamma Cephei IV Getting messy for science Wednesday, September 5, 2012
Gamma Cephei III Keeping a planet on the table Tuesday, September 4, 2012
Gamma Cephei II A gnat’s eyelash and a distant planet Monday, September 3, 2012
Gamma Cephei The top of the king’s starry house Sunday, September 2, 2012
Altairian Planets A star that gets a lot of attention Thursday, July 12, 2012
Double Sunsets Double sunsets on alien worlds Thursday, April 5, 2012
Snow Line A solar system’s best spot for skiing Wednesday, April 4, 2012
Comfy Planets Looking for comfy homes for life Sunday, March 4, 2012
White Dwarfs III Dead planets around dead stars? Friday, February 3, 2012
Pulsar Planets Planets around a dead star Sunday, January 8, 2012
Planetary Bombardment Possible planets take a pounding Thursday, December 29, 2011
Sparkly Rings Bright rings for a distant planet Wednesday, December 28, 2011
Far-Out Earths Warming up some far-out Earths Wednesday, December 7, 2011
Brilliant Jupiter Shining some light on a dark giant Thursday, October 27, 2011
Hottest Planet A world that’s hotter than Texas Wednesday, October 26, 2011
Kepler III Two ways to find planets Saturday, August 27, 2011
Kepler II Winnowing a list of possible planets Friday, August 26, 2011
Kepler I Watching for some stars to blink Thursday, August 25, 2011
Moon and Jupiter Young, vigorous star systems Friday, August 19, 2011
Moon and Saturn "Listening" for distant worlds Wednesday, August 3, 2011
Proxima Centauri Planets? Filling in the details on our closest neighbor Friday, May 27, 2011
Gliese 179 An unexpectedly big planet Thursday, May 26, 2011
Red Dwarf Planets Looking for close planets around close stars Tuesday, May 24, 2011
Kepler 11 A star with a big family of planets Friday, April 22, 2011
Basket O' Planets A basketful of planets Thursday, April 21, 2011
Moon and Antares An unlikely abode for life Wednesday, April 20, 2011
Denebola Shining through the moonlight Friday, March 18, 2011
Shortest Year Birthdays by the basketful Sunday, March 13, 2011
Dubhe Skies as different from ours as night and day Wednesday, February 23, 2011
Interesting Planets Interesting worlds in other star systems Friday, February 11, 2011
Beta Pictoris A speck of light with a difference Thursday, February 10, 2011
Upsilon Andromedae An out-of-whack solar system Wednesday, February 9, 2011
Defining Planets An uncertain count of planets Tuesday, February 8, 2011
Counting Planets II Keeping score in the search for planets Thursday, January 20, 2011
Counting Planets Adding to the planetary census Wednesday, January 19, 2011
Habitable Zones Looking for worlds with rainy days Tuesday, January 18, 2011
Plurality of Worlds Changing ideas about the universe Monday, January 17, 2011

Featured Images

Artist's concept of the star system 51 Pegasi, featuring a giant planet
The First Monday, October 12, 2015
Artist's concept of a young Jupiter-like planet
Young Giant Thursday, August 27, 2015
Artist's concept of a moons orbiting a Jupiter-like exoplanet
Worlds of Worlds Tuesday, June 9, 2015
Ringfest Wednesday, May 20, 2015
View of a newly forming planetary system around the young star HL Tauri
Planet Tracks Thursday, November 6, 2014
Diagram showing the layouts of several exoplanet systems
Going Farther Wednesday, April 30, 2014
Artist's concept of a range of recently discovered exoplanets
Planet Hunting Monday, April 28, 2014
Artist's concept of a double sunset on exoplanet Kepler 16
Double Sunset Wednesday, March 5, 2014
Artist's concept of exoplanet system KOI-961, discovered by Kepler spacecraft
Worlds Galore Monday, March 3, 2014
Artist's concept of extrasolar planet Kepler 78b, an Earth-sized world
Hot Rock Thursday, October 31, 2013
Hubble Space Telescope images of the Fomalhaut star system
Giant Planet of Mystery Tuesday, October 15, 2013
Artist's concept of planet HAT-P7b
Hot Spot Friday, August 16, 2013
Artist's concept of a blue exoplanet
Blue-Hot Planet Saturday, July 13, 2013
Dusty Vega system
Dust Trap Friday, June 14, 2013
Artist's depiction of planet orbiting Alpha Centauri B
Close Neighbor Sunday, April 21, 2013
Infrared image of the star Fomalhaut (center) and surround debris ring
Messy Building Zone Tuesday, September 18, 2012
Artist's concept of the Gamma Cephei star system
Stellar Geometry Tuesday, September 4, 2012
Altair is one of the three planets of the Summer Triangle
Flying Eagle Thursday, July 12, 2012
A flare on the surface of the star HD 189733 blasts away the atmosphere of an or
Zapped! Friday, June 29, 2012
Artist's concept of the Kepler-35 system, with a giant planet orbiting two stars
Seeing Double Wednesday, April 4, 2012
Artist's concept of the pulsar and planets in the system PSR B1257+12
Second-Chance Planets Sunday, January 8, 2012
An artist's concept of the darkest planet yet discovered
Dark World Thursday, October 27, 2011
Artist's concept of a free-floating planet in the Milky Way galaxy
Free Agent Thursday, May 19, 2011
Artist's concept of TW Hydra, a young star encircled by a disk of gas and dust
Messy Youngster Monday, April 25, 2011
Artist's concept of the planetary system Kepler 11
Close Family Friday, April 22, 2011
Newly forming planetary system around Beta Pictoris
Messy Star System Thursday, February 10, 2011
Earth is in the middle of the Sun's habitable zone
In the Zone Tuesday, January 18, 2011
Artist's concept of a protoplanetary disk with wide gaps
Planet Nursery Monday, October 4, 2010
Evaporating planet around the star HD209458
Puffy Planet Thursday, August 26, 2010
Three of the four planets that are known to orbit the red-dwarf star Gliese 581
Homey Star System Wednesday, April 28, 2010
(Almost) Just Like Home Sunday, February 21, 2010


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