comscore NASA’s Curiosity rover measures seasonal patterns in Mars atmosphere
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NASA’s Curiosity rover measures seasonal patterns in Mars atmosphere

Celebrating two years on Mars, NASA’s Curiosity rover had been taking notes of seasonal patterns on the planet.

  • Updated: May 15, 2016 9:05 AM IST
curiosity-rover-selfie

The local atmosphere in Mars is clear in winter, dustier in spring and summer, and windy in autumn, show measurements by NASA’s Curiosity rover that has completed recording environmental patterns through two full cycles of Martian seasons. Curiosity this week completed its second Martian year since landing inside Gale Crater nearly four years ago. The repetition helps distinguish seasonal effects from sporadic events, NASA‘s Jet Propulsion Laboratory said in a statement. Also Read - NASA’s Ingenuity Mars Helicopter uses same chip as Samsung Galaxy S5, OnePlus One

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Each Martian year — the time it takes the Red Planet to orbit the sun once — lasts 687 Earth days. Measurements of temperature, pressure, ultraviolet light reaching the surface and the scant water vapor in the air at Gale Crater show strong, repeated seasonal changes, the statement added. Also Read - NASA astronauts complete seven hour spacewalk to prep ISS for new solar panels

Monitoring the modern atmosphere, weather and climate fulfills a Curiosity mission goal supplementing the better-known investigations of conditions billions of years ago. Back then, Gale Crater had lakes and groundwater that could have been good habitats for microbes, if Mars has ever had any.

ALSO READ: Curiosity rover tastes scooped sand for first time on Mars

Today, though dry and much less hospitable, environmental factors are still dynamic, the statement added. Curiosity measured air temperatures from 15.9 degrees Celsius on a summer afternoon, to minus 100 degrees Celsius on a winter night.

“Curiosity’s weather station has made measurements nearly every hour of every day, more than 34 million so far,” said Curiosity project scientist Ashwin Vasavada of NASA’s Jet Propulsion Laboratory, Pasadena, California.

ALSO READ: Curiosity spots rocks rich in silica on Mars, bolsters water presence

“The duration is important, because it’s the second time through the seasons that lets us see repeated patterns,” Vasavada noted.

The similar tilts of Earth and Mars give both planets a yearly rhythm of seasons. But some differences are great, such as in comparisons between day and night temperatures. Even during the time of the Martian year when temperatures at Gale Crater rise above freezing during the day, they plummet overnight below minus 90 degrees Celsius, due to the thin atmosphere.

Also, the more-elliptical orbit of Mars, compared to Earth, exaggerates the southern-hemisphere seasons, making them dominant even at Gale Crater’s near-equatorial location.

“Mars is much drier than our planet, and in particular Gale Crater, near the equator, is a very dry place on Mars,” Germ n Martinez, Curiosity science-team collaborator at the University of Michigan, Ann Arbor. “The water vapor content is a thousand to 10 thousand times less than on Earth,” he added.

While continuing to study the modern local environment, Curiosity is investigating geological layers of lower Mount Sharp, inside Gale Crater, to increase understanding of ancient changes in environmental conditions, NASA said.

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  • Published Date: May 15, 2016 9:00 AM IST
  • Updated Date: May 15, 2016 9:05 AM IST



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