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A sol is the apparent interval between two successive returns of the Sun to the same meridian (sundial time) as seen by an observer on Mars. It is one of several units for timekeeping on Mars. A sol is slightly longer than an Earth day. It is approximately 24 hours, 39 minutes, 35 seconds long.
The two Viking mission landers, Mars Phoenix, the Mars Science Laboratory rover Curiosity, InSight, and Mars 2020 Perseverance missions all count the sol on which the lander touched down as "Sol 0". Mars Pathfinder and the two Mars Exploration Rovers instead defined touchdown as "Sol 1".
Mars hosts many enormous extinct volcanoes (the tallest is Olympus Mons, 21.9 km or 13.6 mi tall) and one of the largest canyons in the Solar System (Valles Marineris, 4,000 km or 2,500 mi long). Geologically, the planet is fairly active with marsquakes trembling underneath the ground, dust devils sweeping across the landscape, and cirrus clouds.
Two new studies provide two new answers to the mystery of where Mars's water ... of 93 million miles. Mars’s orbit is much more elliptical—with an aphelion, or furthest remove from the sun, of ...
Water was first discovered on Mars in 2008 by NASA’s Phoenix Mars lander. The agency’s rovers have been exploring the Martian surface and looking for the ingredients and signs of ancient ...
gives 4375 sols since the Mars Science Laboratory landed on Mars; This template was created for use on Mars mission pages, NASA ones in particular, which identify mission milestones based on the mission sol which begins with sol 0 on the landing date for rover and landers and the orbital insertion date for orbiters.
This new figure was compared with previous estimates of the core’s radius that were ... a radius between 1,112 and 1,150 miles (1,790 and 1,850 kilometers). ... station like InSight onto Mars ...
Curiosity rover on Mars (5 August 2015). The Mars Science Laboratory and its rover, Curiosity, were launched from Earth on 26 November 2011. As of November 24, 2024, Curiosity has been on the planet Mars for 4373 sols (4493 total days; 12 years, 110 days) since landing on 6 August 2012.