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Olympia Undae is a large field of sand dunes surrounding Mars' North Polar ice cap. High latitude covers them with water and carbon dioxide frost in the winter so they are illuminated. NASA's Mars Reconnaissance Orbiter views these best in summer.
Olympia Undae is a large field of sand dunes surrounding Mars' North Polar ice cap. High latitude covers them with water and carbon dioxide frost in the winter so they are illuminated. NASA's Mars Reconnaissance Orbiter views these best in summer.

Changing Dunes and Ripples in Olympia Undae

This IR image from NASA's 2001 Mars Odyssey spacecraft shows streamlined islands in the channel of Mangala Valles.
This IR image from NASA's 2001 Mars Odyssey spacecraft shows streamlined islands in the channel of Mangala Valles.

Mangala Valles

Today's image from NASA's 2001 Mars Odyssey spacecraft shows the shallower extension of Coprates Chamsa called Coprates Catena.
Today's image from NASA's 2001 Mars Odyssey spacecraft shows the shallower extension of Coprates Chamsa called Coprates Catena.

Coprates Catena

The Martian north polar layered deposits are an ice sheet much like the Greenland ice sheet on the Earth in this image from NASA's Mars Reconnaissance Orbiter. This Martian ice sheet contains many layers that record variations in the Martian climate.
The Martian north polar layered deposits are an ice sheet much like the Greenland ice sheet on the Earth in this image from NASA's Mars Reconnaissance Orbiter. This Martian ice sheet contains many layers that record variations in the Martian climate.

Icy Layers and Climate Fluctuations near the Martian North Pole

Valleys much younger than well-known ancient valley networks on Mars are evident near the informally named 'Heart Lake' on Mars. This map based on NASA's MGS data presents color-coded topographical information overlaid onto a photo mosaic.
Valleys much younger than well-known ancient valley networks on Mars are evident near the informally named 'Heart Lake' on Mars. This map based on NASA's MGS data presents color-coded topographical information overlaid onto a photo mosaic.

Landscape of Former Lakes and Streams on Northern Mars

NASA's Mars rover Curiosity used its Mast Camera (Mastcam) to take the images combined into this mosaic of the drill area, called 'John Klein,' where the rover ultimately performed its first sample drilling.
NASA's Mars rover Curiosity used its Mast Camera (Mastcam) to take the images combined into this mosaic of the drill area, called 'John Klein,' where the rover ultimately performed its first sample drilling.

Investigating Curiosity's Drill Area

The windstreaks in this image are located in Daedalia Planum as seen by NASA's 2001 Mars Odyssey spacecraft.
The windstreaks in this image are located in Daedalia Planum as seen by NASA's 2001 Mars Odyssey spacecraft.

Windstreaks

Three bite marks left in the Martian ground by the scoop on the robotic arm of NASA's Mars rover Curiosity are visible in this image. Each of the three bites is about 2 inches (5 centimeters) wide.
Three bite marks left in the Martian ground by the scoop on the robotic arm of NASA's Mars rover Curiosity are visible in this image. Each of the three bites is about 2 inches (5 centimeters) wide.

Curiosity's First Three Bites Into Martian Ground

This 360-degree stereo panorama assembled from images taken by the navigation camera on NASA's Mars Exporation Rover Opportunity shows terrain surrounding the position where the rover spent its 3,000th Martian day working on Mars (July 2, 2012).
This 360-degree stereo panorama assembled from images taken by the navigation camera on NASA's Mars Exporation Rover Opportunity shows terrain surrounding the position where the rover spent its 3,000th Martian day working on Mars (July 2, 2012).

Opportunity's Surroundings on 3,000th Sol, in 3-D

This 360-degree mosaic of images from the navigation camera on NASA's Mars Exploration Rover Opportunity shows the view from the western rim of
This 360-degree mosaic of images from the navigation camera on NASA's Mars Exploration Rover Opportunity shows the view from the western rim of

View of 'Santa Maria' Crater from Western Rim, Sol 2454 (Vertical)

NASA's Mars Exploration Rover Opportunity used its navigation camera to acquire this view looking toward the southwest. The scene includes tilted rocks at the edge of a bench surrounding 'Cape York,' with Burns formation rocks exposed in 'Botany Bay.'
NASA's Mars Exploration Rover Opportunity used its navigation camera to acquire this view looking toward the southwest. The scene includes tilted rocks at the edge of a bench surrounding 'Cape York,' with Burns formation rocks exposed in 'Botany Bay.'

Opportunity's View Leaving 'Cape York'

The robotic arm on NASA's Mars rover Curiosity delivered a sample of Martian soil to the rover's observation tray for the first time during the mission's 70th Martian day, or sol (Oct. 16, 2012).
The robotic arm on NASA's Mars rover Curiosity delivered a sample of Martian soil to the rover's observation tray for the first time during the mission's 70th Martian day, or sol (Oct. 16, 2012).

First Sample Placed on Curiosity's Observation Tray

As the last step in a series of inspections of the Mars Hand Lens Imager (MAHLI) aboard NASA's Mars rover Curiosity, this camera's reclosable dust cover was opened for the first time on Sept. 8, 2012.
As the last step in a series of inspections of the Mars Hand Lens Imager (MAHLI) aboard NASA's Mars rover Curiosity, this camera's reclosable dust cover was opened for the first time on Sept. 8, 2012.

Martian Ground Seen by Arm Camera With and Without Dust Cover (Thumbnails)

This map shows the frequency of carbon dioxide frost's presence at sunrise on Mars, as a percentage of days year-round, based on data from NASA's Mars Reconnaissance Orbiter.
This map shows the frequency of carbon dioxide frost's presence at sunrise on Mars, as a percentage of days year-round, based on data from NASA's Mars Reconnaissance Orbiter.

Where on Mars Does Carbon Dioxide Frost Form Often?

The Chemistry and Camera (ChemCam) instrument on NASA's Mars rover Curiosity used its laser and spectrometers to examine what chemical elements are in a drift of Martian sand during the mission's 74th Martian day, or sol (Oct. 20, 2012).
The Chemistry and Camera (ChemCam) instrument on NASA's Mars rover Curiosity used its laser and spectrometers to examine what chemical elements are in a drift of Martian sand during the mission's 74th Martian day, or sol (Oct. 20, 2012).

Laser Hit on Martian Sand Target, Before and After

Two donut-shaped tracks make an infinity symbol, and mark the first two drives of NASA's Curiosity rover. The landing site is at the far right.
Two donut-shaped tracks make an infinity symbol, and mark the first two drives of NASA's Curiosity rover. The landing site is at the far right.

From Infinity and Beyond

The Curiosity engineering team created this cylindrical projection view from images taken by NASA's Curiosity rover rear hazard avoidance cameras underneath the rover deck on Sol 0. Pictured here are the 'pigeon-toed' wheels in their stowed position from
The Curiosity engineering team created this cylindrical projection view from images taken by NASA's Curiosity rover rear hazard avoidance cameras underneath the rover deck on Sol 0. Pictured here are the 'pigeon-toed' wheels in their stowed position from

A View From Below the Rover Deck

This NASA Spirit image view is toward the south, looking down at Spirit's rear wheels. It is one of a series of wide-angle views shown one after the other. Go to the Photojournal to view the animation.
This NASA Spirit image view is toward the south, looking down at Spirit's rear wheels. It is one of a series of wide-angle views shown one after the other. Go to the Photojournal to view the animation.

Rear Camera View of Backward Drive, Sols 2145-2154

Comet Siding Spring will have a close approach to Mars on Oct. 19, 2014. This artist's concept shows people in the Southern Hemisphere where to look for Mars in the night sky. Mars and the comet may be visible with binoculars.
Comet Siding Spring will have a close approach to Mars on Oct. 19, 2014. This artist's concept shows people in the Southern Hemisphere where to look for Mars in the night sky. Mars and the comet may be visible with binoculars.

View of Comet Siding Spring from Southern Hemisphere (Artist's Concept)

The dunes in this image from NASA's 2001 Mars Odyssey spacecraft are still partial covered in frost. They will get darker and darker as the frost is removed and the underlying dark material is completely exposed.
The dunes in this image from NASA's 2001 Mars Odyssey spacecraft are still partial covered in frost. They will get darker and darker as the frost is removed and the underlying dark material is completely exposed.

Frosted Dunes

Layering in south polar ice is easy to see in this outlier of the main polar cap. This image was captured by NASA's Mars Odyssey.
Layering in south polar ice is easy to see in this outlier of the main polar cap. This image was captured by NASA's Mars Odyssey.

South Polar Layers

This nearly global mosaic of observations from NASA's Mars Reconnaissance Orbiter on Nov. 18, 2012, shows a dust storm in Mars' southern hemisphere. Small white arrows outline the area where dust from the storm is apparent in the atmosphere.
This nearly global mosaic of observations from NASA's Mars Reconnaissance Orbiter on Nov. 18, 2012, shows a dust storm in Mars' southern hemisphere. Small white arrows outline the area where dust from the storm is apparent in the atmosphere.

Martian Dust Storm, Nov. 18, 2012

This channel is located in the volcanic flows north of Olympus Mons as seen by NASA's Mars Odyssey.
This channel is located in the volcanic flows north of Olympus Mons as seen by NASA's Mars Odyssey.

Channels

This image from NASA's 2001 Mars Odyssey shows the sand sheet with dune forms located on the floor of Rabe Crater.
This image from NASA's 2001 Mars Odyssey shows the sand sheet with dune forms located on the floor of Rabe Crater.

Rabe Crater Dunes

This image captured by NASA's Mars Odyssey shows layering in the south polar cap.
This image captured by NASA's Mars Odyssey shows layering in the south polar cap.

South Polar Layers

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