This week, NASA’s Mars Curiosity Rover celebrated its 2,000th Martian day (or Sol) on the Red Planet. The nuclear-powered rover was launched from Cape Canaveral on November 26, 2011, and landed on Aeolis Palus in Gale Crater on Mars on August 6, 2012. A Mars day is slightly longer than a day here on Earth: a sidereal day is 24 hours, 37 minutes, and 22 seconds (on Earth, it is 23 hours, 56 minutes, and 4.1 seconds) and a solar day is 24 hours, 39 minutes, and 35 seconds (on Earth, 24 hours).

Curiosity’s Sol 2,000

Mars Curiosity Rover Selfie
This self-portrait of NASA’s Curiosity Mars rover shows the vehicle at the “Mojave” site, where its drill collected the mission’s second taste of Mount Sharp.
The scene combines dozens of images taken during January 2015 by the Mars Hand Lens Imager (MAHLI) camera at the end of the rover’s robotic arm. The pale “Pahrump Hills” outcrop surrounds the rover, and the upper portion of Mount Sharp is visible on the horizon. The darker ground at upper right and lower left hold ripples of wind-blown sand and dust. Image:
Some conspiracy theorists ask “where is the robotic arm?”, “who took this photo?”, “who holds the camera” etc. The view does not include the rover’s robotic arm. Wrist motions and turret rotations on the arm allowed MAHLI to acquire the mosaic’s component images. The arm was positioned out of the shot in the images, or portions of images, that were used in this mosaic. This process was used previously in acquiring and assembling Curiosity self-portraits taken at sample-collection sites “Rocknest” (PIA16468), “John Klein” (PIA16937) and “Windjana” (PIA18390).

Curiosity Rover’s planned mission duration was two years 668 sols (687 days). In December 2012, Curiosity’s two-year mission was extended indefinitely. Today, as of March 24, 2018, it spent Current: 2001 sols (2056 days) since landing, and we don’t expect a pit stop any time soon. During this time, the car-sized rover covered a distance of 11.6 miles (18.7 kilometers).

The rover’s primary goal was to determine if Mars was ever able to support microbial life, as well as determining the role of water, and to study the climate and geology of Mars.

In the video below, Curiosity Project Scientist Ashwin Vasavada gives a descriptive tour of the Mars rover’s view in Gale Crater. The white-balanced scene looks back over the journey so far.
The view from “Vera Rubin Ridge” looks back over buttes, dunes and other features along the route. To see where the Curiosity rover is now, visit NASA’s “Where is Curiosity?” web page. To aid geologists, colors in the image are white balanced so rocks appear the same color as the same rocks would on Earth.

Curiosity Project Scientist Ashwin Vasavada gives a descriptive tour of the Mars rover’s view in Gale Crater. The white-balanced scene looks back over the journey so far.
The view from “Vera Rubin Ridge” looks back over buttes, dunes, and other features along the route.

Goals and Objectives of the Curiosity Rover


  1. Determine the nature and inventory of organic carbon compounds
  2. Investigate the chemical building blocks of life (carbon, hydrogen, nitrogen, oxygen, phosphorus, and sulfur)
  3. Identify features that may represent the effects of biological processes (biosignatures and biomolecules)

Geological and geochemical

  1. Investigate the chemical, isotopic, and mineralogical composition of the Martian surface and near-surface geological materials
  2. Interpret the processes that have formed and modified rocks and soils

Planetary process

  1. Assess long-timescale (i.e., 4-billion-year) Martian atmospheric evolution processes
  2. Determine present state, distribution, and cycling of water and carbon dioxide

Surface radiation

  1. Characterize the broad spectrum of surface radiation, including galactic and cosmic radiationsolar proton events, and secondary neutrons. As part of its exploration, it also measured the radiation exposure in the interior of the spacecraft as it traveled to Mars, and it is continuing radiation measurements as it explores the surface of Mars. This data would be important for future crewed missions.

About one year into the surface mission, and having assessed that ancient Mars could have been hospitable to microbial life and finding active, ancient organic chemistry on Mars, the MSL mission objectives evolved to developing predictive models for the preservation process of organic compounds and biomolecules; a branch of paleontology called taphonomy.

Mars Curiosity Rover view of Mount Sharp
Curiosity Rover’s view of “Mount Sharp”. This composite image looking toward the higher regions of Mount Sharp was taken on September 9, 2015, by NASA’s Curiosity rover. In the foreground – about 2 miles (3 kilometers) from the rover – is a long ridge teeming with hematite, an iron oxide. Just beyond is an undulating plain rich in clay minerals. And just beyond that are a multitude of rounded buttes, all high in sulfate minerals. The changing mineralogy in these layers of Mount Sharp suggests a changing environment in early Mars, though all involve exposure to water billions of years ago. The Curiosity team hopes to be able to explore these diverse areas in the months and years ahead. Further back in the image are striking, light-toned cliffs in rock that may have formed in drier times and now is heavily eroded by winds. Image: NASA


  1. A sidereal day is the length of time it takes a planet to rotate from the perspective of a distant star. For the planet Earth, a sidereal day is approximately 23 hours, 56 minutes, and 4 seconds. By contrast, solar time is reckoned by the movement of the Earth from the perspective of the Sun. The “solar day”, or simply “day” is 24 hours, so it is slightly longer than the sidereal day because of the amount the Earth moves each day in its orbit around the Sun. For a great explanation of what is a sidereal day (or a solar day), watch the video below from 5:30.
“How Earth Moves” by Vsauce.
Sidereal day
The stellar day or “sidereal day” is shorter than the solar day. At time 1, the Sun and a certain distant star are both overheads. At time 2, the planet has rotated 360° and the distant star is overhead again but the Sun is not (1->2 = one stellar day). It is not until a little later, at time 3, that the Sun is overhead again (1->3 = one solar day). Image: Wikipedia


M. Özgür Nevres
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