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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

Disappearing Acts Slipping behind the Sun September 2, 2019

Vega Stirring up dust around a bright star June 14, 2019

Jupiter at Opposition III A big move for a giant planet June 11, 2019

Moon and Planets Growing giants beyond the snow line April 23, 2019

Vernal Equinox Moving Earth away from the middle March 19, 2019

The Dominator Dominating the solar system March 17, 2019

Mars and Uranus Red and green in the evening sky February 9, 2019

Allende Meteorite Rocks that are older than Earth February 8, 2019

Barycenter Going around points in space January 14, 2019

Moon and Planets Slow-moving conversations January 1, 2019

Morning Lights Lighting up the dawn of the new year December 31, 2018

Jupiter and Mercury Bright worlds in the dawn sky December 19, 2018

OSIRIS-REx Snuggling up to an asteroid November 29, 2018

Round Earth Rounding off planet Earth September 3, 2018

More Moon and Venus Putting Venus in its place August 14, 2018

Far from the Sun Measuring the distance to the Sun July 6, 2018

More Saturn at Opposition A planet “opposes” the Sun June 27, 2018

Saturn at Opposition Racing past three bright planets June 24, 2018

Moon and Jupiter A shoving match in the early solar system April 29, 2018

Morning Mercury Building a little planet April 20, 2018

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

Featured Images

A comparison of the Vega system and our solar system

Scaled-Up Solar System June 14, 2019

Hayabusa 2 on Ryugu; Beresheet heads for the Moon

Space Shots February 22, 2019

2014 MU69, a ball of ice and rock about four billion miles from Earth, is the next target for New Horizons

Next Target December 28, 2018

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