Tag Archives: impacts

Asteroid impacts+hydrogen = recipe for Mars life

A new study reveals asteroid impacts on ancient Mars could have produced key ingredients for life if the Martian atmosphere was rich in hydrogen. An early hydrogen-rich atmosphere on Mars could also explain how the planet remained habitable after its … Continue reading

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THEMIS: Big impacts and little in Terra Cimmeria

THEMIS Image of the Day, March 13, 2019. This VIS image contains three craters. There is a quarter of the largest crater in the top half of the image, half of a smaller crater at the very top, and the … Continue reading

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Recently formed crater clusters on Mars

[Editor’s note: From a paper by Ingrid Daubar and three co-authors recently published in the Journal of Geophysical Research.] Recently Formed Crater Clusters on Mars • We report on properties of new dated crater clusters on Mars; most clusters in … Continue reading

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HiRISE: Recent impact site in Noachis Terra

This image shows a recent impact in Noachis Terra in the southern mid-latitudes of Mars. The impact occurred in dark-toned ejecta material from a degraded, 60-kilometer crater to the south. Rather than a single impact crater, we see multiple impacts … Continue reading

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THEMIS: Out of round

THEMIS Image of the Day, January 21, 2018. This VIS image shows a group of craters in Terra Sirenum. The apparent youngest one is the center crater with the scalloped rim. Subsurface tectonic features like faults can interfere with crater … Continue reading

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Phobos may have come from big impact on Mars

Spectral fingerprints of Phobos’ surface support an ancient big crash origin for the Martian moon. The weird shapes and colors of the tiny Martian moons Phobos and Deimos have inspired a long-standing debate about their origins. The dark faces of … Continue reading

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HiRISE: New crater blues

New crater blues. This new impact was found by the Context Camera team who asked HiRISE to take a high-resolution image. They estimated the impact happened between January 2012 and September 2016, because they have a picture from the  THEMIS … Continue reading

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THEMIS: Impact blast scars on crater rim

THEMIS Image of the Day, June 12, 2018. Today’s VIS image shows part of a crater located north of Hecates Tholus. The radial grooves in the ejecta blanket are still visible around the crater rim. There is also likely blast … Continue reading

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THEMIS: Blast scour at Bonestell Crater

THEMIS Image of the Day, April 17, 2018. Bonestell Crater is a relatively young crater located in Acidalia Planitia. The grooved surface of the ejecta blanket is evident in this VIS image. The grooves were likely eroded by the outward … Continue reading

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Asteroids from a martian mega-impact?

Like evidence left at a crime scene, the mineral olivine may be the clue that helps scientists piece together Mars’s possibly violent history. Could a long-ago giant impact have flung pieces of Mars throughout our inner solar system? Two researchers … Continue reading

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