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Solar System

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



Asteroids February 19, 2016


Venus February 10, 2016

Realm of the Giants June 10, 2010

Radio Programs

Venus and Jupiter Bright planets in the dawn sky November 11, 2017

Neptune III Splitting up a set of twins September 5, 2017

Alexis Bouvard Inklings of an eighth planet June 26, 2017

Heading North Heading north through the Milky Way May 26, 2017

Asteroid Belt A ring of debris around the Sun May 1, 2017

Moon, Mars, and Mercury Balls of rock in the evening sky March 29, 2017

Moon and Planets Too hot, too cold, and just right January 30, 2017

Moon and Mercury A bowling-ball planet January 24, 2017

Moon and Saturn A new idea about the rings of Saturn January 23, 2017

Heating Up Heating up the young Earth September 23, 2016

OSIRIS-Rex Digging into some leftovers September 6, 2016

More Juno at Jupiter Probing the birth of the planets July 3, 2016

Moon and Mars Heating up the Red Planet June 16, 2016

Stolen Sedna A case of interstellar theft May 16, 2016

Mercury Transit Dotting the face of the Sun May 6, 2016

Moon and Jupiter Jupiter throws around its weight April 17, 2016

Jupiter at Opposition How to make a giant planet March 7, 2016

Moon and Jupiter The might of a giant planet — after this. February 23, 2016

Stardust Catching bits of stardust January 15, 2016

Venus and Mars Planets huddle close in the dawn sky November 1, 2015

Hunting Planets IV Patiently looking for planets August 28, 2015

Iron Rain Showering Earth with iron raindrops August 17, 2015

Second Generation A second generation of planets June 7, 2015

Saturn at Opposition A big show for a big planet May 17, 2015

Meteorites II Measuring the age of the solar system April 17, 2015

Local Environment Bubbles and clouds around the solar system April 10, 2015

Moon and Venus Shaking up the solar system March 21, 2015

Triple Play II Two very different neighbors February 19, 2015

Brackets Bright lights bracket the evening sky January 31, 2015

Icy Time Capsules Refugees from the realm of the giants January 7, 2015

Moon and Jupiter Closing in on two dwarf planets January 6, 2015

Close to the Sun Snuggling close to the Sun January 2, 2015

Hailstorm The inner planets take a beating December 28, 2014

Moon and Jupiter Measuring the solar system with a ruler December 9, 2014

Moon and Planets Ringing out the weekend August 30, 2014

Planet Pairings Pairs of planets bracket the Sun August 15, 2014

Venus and Mercury Bright, hot planets in the dawn sky July 10, 2014

Distant Neighbors Looking for distant neighbors May 20, 2014

Distant Realms A realm of iceballs far from the Sun May 19, 2014

Distant Borders Crossing a distant border May 18, 2014

Moon and Jupiter Winging through the skies of Jupiter April 5, 2014

Lithopanspermia Catching a ride to the outer solar system March 30, 2014

Quaoar Measuring a distance ice-ball March 10, 2014

Jupiter at Opposition Pacing off the distance to a giant January 4, 2014

Moon and Planets Two planets wander across the sky November 29, 2013

Dawn Planets Siblings with no family resemblance November 23, 2013

Moon and Jupiter Centering up a bright duo November 19, 2013

Mars and Regulus Wandering across the night sky October 12, 2013

Venus and Spica The always-hot “evening star” September 4, 2013

Jupiter and Mars Jogging into the morning sky July 20, 2013

Moon and Planets Lining up the “evening star” June 9, 2013

At the Edge At the edge of the solar system June 7, 2013

Young-Sun Paradox II A weight-loss plan for the Sun June 6, 2013

Young-Sun Paradox Turning up the thermostat June 5, 2013

Changing Sun Our steadily changing Sun June 4, 2013

Bright Contrasts Different worlds with a similar look May 26, 2013

Model Cosmos Taking the measure of the solar system May 2, 2013

Flashy Neighbor Evidence of a flashy neighbor January 21, 2013

Jupiter at Opposition II Jupiter proves its superiority December 1, 2012

Shrinking Iceball A distant iceball gets smaller October 18, 2012

Moon and Jupiter A planet that’s a gravitational powerhouse October 3, 2012

Double Impact Bowling over a giant planet September 29, 2012

Water Worlds Filling oceans on distant worlds September 23, 2012

Moon and Mars Prime real estate on other worlds September 18, 2012

Dune Worlds Giant sand dunes on alien worlds August 30, 2012

Dawn A witness to the dawn of the solar system August 21, 2012

Moon, Venus, Mercury Getting close to the Sun August 12, 2012

Moon, Jupiter, and Aldebaran The Moon takes a pounding August 9, 2012

Comet Exchange Stars exchange frozen leftovers June 14, 2012

Future Neighbor A future close neighbor to the Sun June 13, 2012

Sun Power Weathering bouts of space weather June 12, 2012

Venus Transit Measuring out a solar-system ruler June 3, 2012

More Venus and Jupiter Worlds with and without companions March 11, 2012

Venus and Jupiter Following a pair of cosmic headlights March 10, 2012

Mars at Opposition Drawing a map of the solar system March 2, 2012

Earth at Perihelion Snuggling close to the Sun January 3, 2012

Featured Images

Diagram of the asteroid belt

Leftovers May 1, 2017

Cassini view of Earth, Moon, and Saturn's rings

Looking Back April 24, 2017

Artist's concept of a young Jupiter-like planet

Young Giant August 27, 2015

Three dwarf planets shown to scale with Earth and Moon

Dwarf Planets January 5, 2015

Peek-a-Boo January 31, 2014

A Voyager spacecraft and the cover of a record of Earth sights and sounds

Words From Home August 20, 2012

Phobos, one of the moons of Mars, passes by the planet Jupiter.

Out of Order June 20, 2011

Venus's path across the Sun during the transit of 1761

Bright Passage June 6, 2011