Nasa's Curiosity rover has captured some stunning sights and amazing science in its 13 months on Mars. But this might be one of the very best.

The US space agency has just released this series of pictures taken three seconds apart, showing Mars' moon Phobos passing in front of the Sun.

Curiosity photographed the annular (aka 'ring') eclipse with its telephoto lens on the Mast Camera pair, on 17 August.

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Phobos is the larger of Mars' two moons, and is an irregular shape with an average radius of just 11km - making it far smaller than our own Moon.

Nasa said that its camera teams had to prepare carefully to capture the event.

It explained:

"Curiosity paused during its drive that sol for a set of observations that the camera team carefully calculated to record this celestial event. The rover's observations of Phobos help make researchers' knowledge of the moon's orbit even more precise.

Because this eclipse occurred near mid-day at Curiosity's location on Mars, Phobos was nearly overhead, closer to the rover than it would have been earlier in the morning or later in the afternoon. This timing made Phobos' silhouette larger against the sun -- as close to a total eclipse of the sun as is possible from Mars."

Find out how Curiosity works in our guide below:

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  • Curiosity at Work on Mars

    This artist's concept depicts the rover Curiosity, of NASA's Mars Science Laboratory mission, as it uses its Chemistry and Camera (ChemCam) instrument to investigate the composition of a rock surface. ChemCam fires laser pulses at a target and views the resulting spark with a telescope and spectrometers to identify chemical elements. The laser is actually in an invisible infrared wavelength, but is shown here as visible red light for purposes of illustration.

  • Daybreak At Gale Crater

    This computer-generated view depicts part of Mars at the boundary between darkness and daylight, with an area including Gale Crater beginning to catch morning light.

  • Curiosity Launch Vehicle

    The Atlas V 541 vehicle was selected for the Mars Science Laboratory mission because it has the right liftoff capability for the heavy weight requirements of the rover and its spacecraft.

  • Mars Science Laboratory Spacecraft During Cruise

    This is an artist's concept of NASA's Mars Science Laboratory spacecraft during its cruise phase between launch and final approach to Mars. The spacecraft includes a disc-shaped cruise stage (on the left) attached to the aeroshell. The spacecraft's rover (Curiosity) and descent stage are tucked inside the aeroshell.

  • Curiosity Approaching Mars

    The Curiosity rover is safely tucked inside the spacecraft's aeroshell. The mission's approach phase begins 45 minutes before the spacecraft enters the Martian atmosphere. It lasts until the spacecraft enters the atmosphere.

  • Curiosity Inside Aeroshell

    The Curiosity rover and the spacecraft's descent stage are safely tucked inside the aeroshell at this point. The aeroshell includes a heat shield (on the right, facing in the direction of travel through the atmosphere) and backshell. The diameter of the aeroshell is 14.8 feet (4.5 meters), the largest ever used for a mission to Mars.

  • Mars Science Laboratory Guided Entry At Mars

    The mission's entry, descent, and landing (EDL) phase begins when the spacecraft reaches the top of Martian atmosphere, about 81 miles (131 kilometers) above the surface of the Gale crater landing area, and ends with the rover safe and sound on the surface of Mars. During the approximately seven minutes of EDL, the spacecraft decelerates from a velocity of about 13,200 miles per hour (5,900 meters per second) at the top of the atmosphere, to stationary on the surface.

  • Deceleration of Mars Science Laboratory in Martian Atmosphere

    This artist's concept depicts the interaction of NASA's Mars Science Laboratory spacecraft with the upper atmosphere of Mars during the entry, descent and landing of the Curiosity rover onto the Martian surface.

  • Mars Science Laboratory Parachute

    This is an artist's concept of the Mars Science Laboratory Curiosity rover parachute system.

  • Curiosity While On Parachute

    This is an artist's concept of NASA's Curiosity rover tucked inside the Mars Science Laboratory spacecraft's backshell while the spacecraft is descending on a parachute toward Mars. The parachute is attached to the top of the backshell. In the scene depicted here, the spacecraft's heat shield has already been jettisoned.

  • Curiosity And Descent Stage

    This is an artist's concept of the rover and descent stage for NASA's Mars Science Laboratory spacecraft during the final minute before the rover, Curiosity, touches down on the surface of Mars.

  • Curiosity's Sky Crane Maneuver

    The entry, descent, and landing (EDL) phase of the Mars Science Laboratory mission begins when the spacecraft reaches the Martian atmosphere, about 81 miles (131 kilometers) above the surface of the Gale crater landing area, and ends with the rover Curiosity safe and sound on the surface of Mars.

  • Curiosity Touching Down

    This artist's concept depicts the moment that NASA's Curiosity rover touches down onto the Martian surface.

  • A Moment After Curiosity's Touchdown

    This artist's concept depicts the moment immediately after NASA's Curiosity rover touches down onto the Martian surface.

  • Curiosity Mars Rover

    This artist concept features NASA's Mars Science Laboratory Curiosity rover, a mobile robot for investigating Mars' past or present ability to sustain microbial life.

  • Curiosity's Close-Up

    In this picture, the mast, or rover's "head," rises to about 2.1 meters (6.9 feet) above ground level, about as tall as a basketball player. This mast supports two remote-sensing instruments: the Mast Camera, or "eyes," for stereo color viewing of surrounding terrain and material collected by the arm; and, the ChemCam instrument, which is a laser that vaporizes material from rocks up to about 9 meters (30 feet) away and determines what elements the rocks are made of.

  • Mars Rover Curiosity

    This artist concept features NASA's Mars Science Laboratory Curiosity rover, a mobile robot for investigating Mars' past or present ability to sustain microbial life.