Solar System

The system of our Sun and its planets, including moons, asteroids, and comets.


Remnants from the Beginning Whenever you build a new house, you always have...
Realm of the Giants The region beyond the asteroid belt is the realm...
Exploring Our Own Back Yard The four planets closest to the Sun -- Mercury,...
Asteroids At the dawn of the 19th century, a group of...
Venus Cloud-covered Venus is the second planet from...
The Solar System: Home Sweet Home A middle-aged star, planets large and small,...

Radio Programs

Stardust Catching bits of stardust Friday, January 15, 2016
Venus and Mars Planets huddle close in the dawn sky Sunday, November 1, 2015
Hunting Planets IV Patiently looking for planets Saturday, August 29, 2015
Iron Rain Showering Earth with iron raindrops Tuesday, August 18, 2015
Second Generation A second generation of planets Monday, June 8, 2015
Saturn at Opposition A big show for a big planet Monday, May 18, 2015
Meteorites II Measuring the age of the solar system Saturday, April 18, 2015
Local Environment Bubbles and clouds around the solar system Saturday, April 11, 2015
Moon and Venus Shaking up the solar system Sunday, March 22, 2015
Triple Play II Two very different neighbors Friday, February 20, 2015
Brackets Bright lights bracket the evening sky Sunday, February 1, 2015
Icy Time Capsules Refugees from the realm of the giants Thursday, January 8, 2015
Moon and Jupiter Closing in on two dwarf planets Wednesday, January 7, 2015
Close to the Sun Snuggling close to the Sun Saturday, January 3, 2015
Hailstorm The inner planets take a beating Monday, December 29, 2014
Moon and Jupiter Measuring the solar system with a ruler Wednesday, December 10, 2014
Moon and Planets Ringing out the weekend Sunday, August 31, 2014
Planet Pairings Pairs of planets bracket the Sun Saturday, August 16, 2014
Venus and Mercury Bright, hot planets in the dawn sky Friday, July 11, 2014
Distant Neighbors Looking for distant neighbors Wednesday, May 21, 2014
Distant Realms A realm of iceballs far from the Sun Tuesday, May 20, 2014
Distant Borders Crossing a distant border Monday, May 19, 2014
Moon and Jupiter Winging through the skies of Jupiter Sunday, April 6, 2014
Lithopanspermia Catching a ride to the outer solar system Monday, March 31, 2014
Quaoar Measuring a distance ice-ball Tuesday, March 11, 2014
Jupiter at Opposition Pacing off the distance to a giant Sunday, January 5, 2014
Moon and Planets Two planets wander across the sky Saturday, November 30, 2013
Dawn Planets Siblings with no family resemblance Sunday, November 24, 2013
Moon and Jupiter Centering up a bright duo Wednesday, November 20, 2013
Mars and Regulus Wandering across the night sky Sunday, October 13, 2013
Venus and Spica The always-hot “evening star” Thursday, September 5, 2013
Jupiter and Mars Jogging into the morning sky Sunday, July 21, 2013
Moon and Planets Lining up the “evening star” Monday, June 10, 2013
At the Edge At the edge of the solar system Saturday, June 8, 2013
Young-Sun Paradox II A weight-loss plan for the Sun Friday, June 7, 2013
Young-Sun Paradox Turning up the thermostat Thursday, June 6, 2013
Changing Sun Our steadily changing Sun Wednesday, June 5, 2013
Bright Contrasts Different worlds with a similar look Monday, May 27, 2013
Model Cosmos Taking the measure of the solar system Friday, May 3, 2013
Flashy Neighbor Evidence of a flashy neighbor Tuesday, January 22, 2013
Jupiter at Opposition II Jupiter proves its superiority Sunday, December 2, 2012
Shrinking Iceball A distant iceball gets smaller Friday, October 19, 2012
Moon and Jupiter A planet that’s a gravitational powerhouse Thursday, October 4, 2012
Double Impact Bowling over a giant planet Sunday, September 30, 2012
Water Worlds Filling oceans on distant worlds Monday, September 24, 2012
Moon and Mars Prime real estate on other worlds Wednesday, September 19, 2012
Dune Worlds Giant sand dunes on alien worlds Friday, August 31, 2012
Dawn A witness to the dawn of the solar system Wednesday, August 22, 2012
Moon, Venus, Mercury Getting close to the Sun Monday, August 13, 2012
Moon, Jupiter, and Aldebaran The Moon takes a pounding Friday, August 10, 2012
Comet Exchange Stars exchange frozen leftovers Friday, June 15, 2012
Future Neighbor A future close neighbor to the Sun Thursday, June 14, 2012
Sun Power Weathering bouts of space weather Wednesday, June 13, 2012
Venus Transit Measuring out a solar-system ruler Monday, June 4, 2012
More Venus and Jupiter Worlds with and without companions Monday, March 12, 2012
Venus and Jupiter Following a pair of cosmic headlights Sunday, March 11, 2012
Mars at Opposition Drawing a map of the solar system Saturday, March 3, 2012
Earth at Perihelion Snuggling close to the Sun Wednesday, January 4, 2012
Interstellar Skies Looking for clear interstellar skies Tuesday, November 15, 2011
Near the Edge Nearing the edge of the solar system Monday, November 14, 2011
Moon and Mars Strolling on alien worlds Thursday, October 20, 2011
Uranus at Opposition Diving into an icy planet Sunday, September 25, 2011
More Moon and Jupiter Jumpin' Jupiter! Saturday, August 20, 2011
Moon and Jupiter Young, vigorous star systems Friday, August 19, 2011
Dawn at Vesta III An asteroid with a difference Friday, July 15, 2011
More Moon and Jupiter The solar system's 800-pound gorilla Saturday, June 25, 2011
New Dwarfs New neighbors in the outer solar system Saturday, June 11, 2011
Transit of 1761 Spreading out to watch a little black dot Monday, June 6, 2011
Irene Discovering a "peaceful" planetoid Thursday, May 19, 2011
Moon and Venus A close but far-away planet Friday, April 29, 2011
Taking Inventory Taking inventory of the solar system Saturday, March 26, 2011
Comet Encounter Returning to the scene of a wreck Monday, February 14, 2011
Defining Planets An uncertain count of planets Tuesday, February 8, 2011

Featured Images

Artist's concept of a young Jupiter-like planet
Young Giant Thursday, August 27, 2015
Three dwarf planets shown to scale with Earth and Moon
Dwarf Planets Monday, January 5, 2015
Peek-a-Boo Friday, January 31, 2014
A Voyager spacecraft and the cover of a record of Earth sights and sounds
Words From Home Monday, August 20, 2012
Phobos, one of the moons of Mars, passes by the planet Jupiter.
Out of Order Monday, June 20, 2011
Venus's path across the Sun during the transit of 1761
Bright Passage Monday, June 6, 2011


©2015 The University of Texas McDonald Observatory