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The first planet from the Sun in the solar system. Mercury orbits the Sun at an average distance of 0.4 times Earth’s distance. The planet is just five percent as massive as Earth, and it about 50 percent larger than the Moon. It is made of solid, rocky material that is heavily cratered, and it has no significant atmosphere. Mercury has no moons.


Mercury March 7, 2016

Featured Images

2006 Mercury transit

Seeing Spots November 8, 2019

On Its Way October 20, 2018

Artist's concept of BepiColombo arriving at Mercury in 2025

Heading for Mercury October 4, 2018

Mercury transits the Sun, May 2016

Little Black Dot May 10, 2016

2006 transit of Mercury

Spotty Sun May 6, 2016

Colorful Caloris April 15, 2016

View of Mercury from Messenger spacecraft

Dark Planet October 10, 2015

The Messenger spacecraft's final image of the surface of Mercury

The End April 30, 2015

Messenger view of the surface of Mercury

Getting Closer October 30, 2014

Venus, Mercury, and the earthshine-illuminated crescent Moon

Lighting the Shadows May 30, 2014

Mariner 10 at Mercury

First Encounter March 29, 2014

MESSENGER view of crater Degas on Mercury

Painting a Planet June 17, 2013

Messenger view of Mercury's southern hemisphere

Hard-to-Study Planet September 2, 2011

Messenger view of the surface of Mercury, June 2011

Hello, Sunshine July 2, 2011

MESSENGER's first color image of Mercury, March 29, 2011

First Glimpse March 31, 2011

Artist's concept of Messenger orbiting Mercury

Safe Arrival March 18, 2011

Planetary Tail April 6, 2010

Radio Programs

Mercury Transit Crossing the face of the Sun November 8, 2019

Morning Mercury A bowling ball in the dawn sky August 8, 2019

Evening Mercury A planet with an artistic flair February 27, 2019

Mercury Bound Starting the long trip to Mercury October 4, 2018

Mercury in the Morning Lining up a bright morning planet August 24, 2018

Mercury in the Evening Looking for a reticent planet July 5, 2018

Morning Mercury Building a little planet April 20, 2018

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

Evening Mercury The incredible shrinking planet December 11, 2016

Moon and Mercury Some extra sunrises and sunsets September 27, 2016

Evening Mercury A hot spot on a hot planet April 15, 2016

Moon and Mercury A close but elusive planet April 8, 2016

Morning Mercury A dark planet in the dawn sky October 9, 2015

Evening Mercury Measuring a planetary day April 25, 2015

Venus and Mercury Pointing the way to a little planet January 9, 2015