January 22, 2022

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Celebrate Mars Reconnaissance Orbiter’s Views From Above

14 min read

Marking its 15th anniversary since launch, one of the oldest spacecraft at the Red Planet has provided glimpses of dust devils, avalanches, and more.


Since leaving Earth 15 years ago, NASA’s Mars Reconnaissance Orbiter has reshaped our understanding of the Red Planet. The veteran spacecraft studies temperatures in Mars’ thin atmosphere, peers underground with radar, and detects minerals on the planet’s surface. But perhaps what it’s become best known for are stunning images.

Among its instruments, MRO carries three cameras: The Mars Color Imager (MARCI) has a fisheye lens that produces a daily global view. The Context Camera (CTX) provides 19-mile-wide (30-kilometer-wide) black-and-white terrain shots. Those images, in turn, offer context for the tightly focused images provided by MRO’s third camera, the High-Resolution Imaging Science Experiment (HiRISE), which produces the most striking views.

Able to zoom in on surface features at the highest resolution, the detailed, color images from HiRISE have captured dramatic scenes of nature: tumbling avalanches, skyscraping dust devils, and other features of a changing landscape. The camera has also provided images of other NASA spacecraft at Mars, like the Curiosity and Opportunity rovers. MRO has even flipped itself around to point HiRISE out at Earth and Phobos, one of Mars’ two moons.

As of early August, HiRISE alone had taken 6,882,204 images, generating 194 terabytes of data sent from Mars since 2006. The following images are just a glimpse of the amazing work performed by all three cameras aboard MRO, which is managed by NASA’s Jet Propulsion Laboratory in Southern California.

Welcome to Mars

Image credit: NASA/JPL-Caltech/MSSS
› Full image and caption

Dust storms are routine on Mars. Most are limited to small regions and are not as dramatic as what’s portrayed in movies. But once or twice a decade, a series of regional storms will create a domino effect, lifting enough dust for winds to cover the surface in what’s called a “planet-encircling dust event.” This one, captured by MARCI in the summer of 2018, darkened the region above the Opportunity rover, depriving its solar panels of sunlight and ultimately leading to the end of the mission.

A Martian Sky Scraper

A towering dust devil casts a serpentine shadow over the Martian surface
Image credit: NASA/JPL-Caltech/Univ. of Arizona
› Full image and caption

As HiRISE pans over large swaths of Mars’ surface, it occasionally discovers surprises like this towering dust devil, which was captured from 185 miles (297 kilometers) above the ground. The length of this whirlwind’s shadow indicates that it was more than half a mile (800 meters) high – about the size of the United Arab Emirate’s Burj Khalifa, the tallest building on Earth.

Avalanche Alert

Avalanche plunging down a 1,640-foot-tall (500-meter-tall) cliff
Image credit: NASA/JPL-Caltech/University of Arizona
› Full image and caption

HiRISE has captured avalanches in action. As seasonal ice vaporized in the spring, these 1,640-foot-tall (500-meter-tall) cliffs at Mars’ north pole began to crumble. Such cliffs reveal the deep time scales on the planet, exposing the many layers of ice and dust that have settled during different eras. Like the rings of a tree, each layer has a story to tell scientists about how the environment was changing.

That’s Going to Leave a Dent

A dramatic, fresh impact crater
Image credit: NASA/JPL-Caltech/Univ. of Arizona
› Full image and caption

Mars has a thin atmosphere – just 1% as dense as Earth’s. As a result, there’s less of a protective barrier to burn up space debris. That means larger meteors make it through the Red Planet’s atmosphere than Earth’s. CTX has detected over 800 new impact craters during MRO’s mission. After CTX spotted this one, scientists took a more detailed image with HiRISE.

The crater spans approximately 100 feet (30 meters) in diameter and is surrounded by a large, rayed blast zone. In examining the distribution of ejecta – the debris tossed outward during the formation of a crater – scientists can learn more about the impact event. The explosion that created this crater threw ejecta as far as 9.3 miles (15 kilometers).

The Face of Time

Sand ripples and a large dune
Image Credit: NASA/JPL-Caltech/University of Arizona
› Full image and caption

Land changes over time, so having a spacecraft at Mars for years offers a unique perspective. “The more we look, the more we discover,” said Leslie Tamppari, MRO’s deputy project scientist at JPL. “Before MRO, it wasn’t clear what on Mars really changed, if anything. We thought the atmosphere was so thin that there was almost no sand motion and most dune movement happened in the ancient past.”

We now know that’s not the case. “False color” has been added to this image to accentuate certain details, like the tops of dunes and ripples. Many of these landforms are migrating, as they do on Earth: Sand grain by sand grain, they’re carried by wind, crawling across the planet over millions of years.

Back Atcha, Earth

Composite image of Earth and its moon as seen from Mars
Image credit: NASA/JPL-Caltech/Univ. of Arizona
› Full image and caption

MRO hasn’t only looked at Mars. This composite, made from four sets of HiRISE images of Earth and our Moon, was actually the second time that HiRISE had captured our home planet.

Fearsome Moon

The larger of Mars' two moons, Phobos
Image credit: NASA/JPL-Caltech/University of Arizona
› Full image and caption

Named for the Greek god of fear, Phobos is one of Mars’ two moons (Deimos, named for the god of terror, is the other), and it’s only about 13 miles (21 kilometers) across. Stickney Crater, the indentation on the moon’s lower right, is about 5.6 miles (9 kilometers) wide in this HiRISE image. Despite its small size, Phobos is of great interest to scientists: Is it a captured asteroid, or a chunk of Mars that broke off after a massive impact? A Japanese mission is scheduled to launch to Phobos in the near future, and the moon has been proposed as a staging ground for astronauts before they go to Mars.

Mapmaker’s Tool

Final traverse map for NASA's Opportunity rover
Image credit: NASA/JPL-Caltech/MSSS
› Full image and caption

Based on an image from CTX, this map shows the complete traverse of the Opportunity rover after exploring the planet for more than 15 years. Both HiRISE and CTX are used by scientists to make maps of landing sites for future human and robotic missions as well as to chart the progress of rovers on the ground.

Making Treks

This animation shows the position of NASA's Curiosity rover as it journeyed 1,106 feet (337 meters) through an area of Mount Sharp
Image credit: NASA/JPL-Caltech/University of Arizona
› Full image and caption

HiRISE has frequently been used to snap images of NASA spacecraft on the Martian surface, capturing Spirit, Opportunity, and Curiosity as well as the stationary landers Phoenix and InSight. NASA’s newest rover, Perseverance, is currently on its way to Jezero Crater. After it arrives on Feb. 18, 2021, you can bet there will be some images of it as well.

The Eyes Have It

The appearance of dark markings on Martian slope
Image credit: NASA/JPL-Caltech/Univ. of Arizona
› Full image and caption

It takes sharp eyes to find unique features on Mars, like recurring slope lineae. These dark streaks appear in the same places at around the same times of year. It was initially proposed they were caused by brine, since salt could allow water to remain liquid in the thin Martian atmosphere. The consensus now, however, is that they’re actually caused by dark sand sliding down inclines.

The streaks were discovered by Lujendra Ojha, who was an undergraduate at the University of Arizona, which operates the HiRISE camera, and now is a professor at Rutgers University. “Sometimes you’re just looking at the right place at the right time,” Ojha said. “I was completely baffled when I first spotted this, because I was just a student at the time – I wasn’t even in a planetary program.” Undergraduates work alongside experienced scientists to spot unique features like these in HiRISE images.

Want to see more? Scientists and the public can request specific kinds of MRO images.

For more information about MRO:

https://mars.nasa.gov/mro/

www.nasa.gov/mission_pages/MRO/main/index.html

JPL, a division of Caltech in Pasadena, California, manages the MRO mission for NASA’s Science Mission Directorate in Washington. The University of Arizona, in Tucson, operates HiRISE, which was built by Ball Aerospace & Technologies Corp., in Boulder, Colorado. MARCI and the Context Camera were both built and are operated by Malin Space Science Systems in San Diego.

News Media Contact

DC Agle
Jet Propulsion Laboratory, Pasadena, Calif.
818-393-9011
david.c.agle@jpl.nasa.gov

Alana Johnson / Grey Hautaluoma
NASA Headquarters, Washington
202-672-4780 / 202-358-0668
alana.r.johnson@nasa.gov / grey.hautaluoma-1@nasa.gov

2020-156

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الوكالة الأمريكية للتنمية الدولية للبرنامج في السنوات المالية 2015-2019، وذلك اعتباراً من 30 سبتمبر/ أيلول 2020؛ (2) الخطوات التي اتخذتها الوكالة الأمريكية للتنمية الدولية تجاه المشاريع الجارية ومستويات التوظيف عندما توقفت مساعدات صندوق الدعم الاقتصادي؛ (3) مدى امتثال الوكالة الأمريكية للتنمية الدولية لسياساتها وإجراءاتها الخاصة بمكافحة الإرهاب للسنوات المالية 2015-2019. وقد راجع مكتب مساءلة الحكومة القوانين وسياسات الوكالة وإجراءاتها ووثائقها وبياناتها وقام بتقييم عيّنة قابلة للتعميم من 245 من الجهات الفرعية الحاصلة على المنح للتأكد من الامتثال لسياسات واجراءات الوكالة الأمريكية للتنمية الدولية الخاصة بمكافحة الإرهاب. النتائج التي توصل إليها مكتب مساءلة الحكومة قدمت الحكومة الأمريكية مساعدات للفلسطينيين في الضفة الغربية وقطاع غزة لتعزيز السلام في الشرق الأوسط منذ عام 1993، جزئيا من خلال البرامج التي تُديرها الوكالة الأمريكية للتنمية الدولية ويمولها صندوق الدعم الاقتصادي. وقد توقف هذا التمويل منذ 31 يناير/ كانون الثاني 2019. وبحلول 30 سبتمبر/ أيلول 2020، كانت الوكالة الأمريكية للتنمية الدولية قد انفقت معظم أموال صندوق الدعم الاقتصادي التي تم تخصيصها لبرنامج الضفة الغربية وقطاع غزة في السنوات المالية 2015-2019. على وجه التحديد، انفقت الوكالة الأمريكية للتنمية الدولية 487.3 مليون دولار من أصل 540.4 مليون دولار من مساعدات صندوق الدعم الاقتصادي للبرنامج في السنتين الماليتين 2015 و2016. وأعادت إدارة الرئيس ترامب برمجة الـ 230.1 مليون دولار التي كانت مخصصة للسنة المالية 2017 لبرامج أخرى ولم تخصص مبالغ للسنتين الماليتين 2018 و2019. وأعلنت السلطة الفلسطينية في شهر ديسمبر/ كانون الأول 2018 بأنها لن تقبل المساعدة بعد 31 يناير/ كانون الثاني 2019 بسبب مخاوف لديها بشأن قانون توضيح مكافحة الإرهاب (Anti-Terrorism Clarification Act) لعام 2018. ووفقاً لمسؤولين من وزارة الخارجية الأمريكية والوكالة الأمريكية للتنمية الدولية فإن القانون يتضمن أحكاماً يمكن أن تجعل الجهات المتلقية للمساعدات من صندوق الدعم الاقتصادي خاضعة لدعاوى قضائية أمريكية. وفي شهر يناير/ كانون الثاني 2021، أعلنت إدارة الرئيس بايدن نيتها إستئناف تقديم المساعدات الأمريكية للبرامج في الضفة الغربية وقطاع غزة. اتخذت الوكالة الأمريكية للتنمية الدولية عدة خطوات بشأن المشاريع الجارية ومستويات التوظيف في بعثتها في الضفة الغربية وقطاع غزة بعد توقف تقديم المساعدة للبرنامج اعتبارا من 31 يناير/ كانون الثاني 2019. وقد أوقفت الوكالة الأمريكية للتنمية الدولية 27 مشروعاً جارياً. كما توقفت الوكالة الأمريكية للتنمية الدولية عن إعادة شغل الوظائف المصرح بها في بعثتها في الضفة الغربية وقطاع غزة، واقترحت تخفيضا في قوة العمل، ووضعت حوالي 50 موظفا في مَهام مؤقتة لأنشطة أخرى. ووفقا للوكالة الأمريكية للتنمية الدولية، فإنه اعتبارا من شهر مايو/ أيار 2019، طلبت لجان الكونجرس من الوكالة الأمريكية للتنمية الدولية تعليق تخفيض الوظائف المُخطط له انتظاراً لاستمرار المداولات. وفي حين أن الوكالة الأمريكية للتنمية الدولية لم تنهِ عمل موظفيها، إلا أن عدد موظفي البعثة انخفض بنسبة 39 بالمئة من ديسمبر/ كانون الأول 2017 وحتى سبتمبر/ أيلول 2020 بسبب مُغادرة الموظفين للبعثة وعمليات النقل والاستقالات. تُحدد سياسات وإجراءات مكافحة الإرهاب للوكالة الأمريكية للتنمية الدولية والخاصة بالضفة الغربية وقطاع غزة ثلاثة متطلبات لمُتلقي التمويل من 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