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Image: Australian crater 29 June 2018 together to learn about asteroids, the impact hazard they may pose, and what we can do to protect our planet, families, communities, and future generations from asteroid impacts. It takes place on 30 June each year, which is the anniversary of the largest asteroid impact in recent history, the 1908 Tunguska event in Siberia. This year, ESA is co-hosting a live webcast with the European Southern Observatory packed with expert interviews, news on some of the most recent asteroid science results, and the truth about the dinosaurs. Watch 30 June at 13:00 CEST via Credit: contains modified Copernicus Sentinel data www.esa.int/asteroidday. (2016), processed by ESA, CC BY-SA 3.0 IGO Provided by European Space Agency For Asteroid Day, the Copernicus Sentinel-2A satellite takes us over the Gosses Bluff crater in the Northern Territory of Australia. The crater is visible in the left centre of the image and it is about 22 km in diameter. It was most likely formed 140 million years ago by the impact of a large comet or meteorite slamming into the surface of Earth. This false-colour image shows an extremely dry area with some vegetation visible in reddish colours along the rivers and lakes. The intense colours of the image represent the mineral composition of the land surface, which is clearly visible owing to the lack of vegetation. Azurite is one of the minerals mined here. A series of low hills and drainage structures can be seen in the lower part of the image, a result of erosion over the years. The West MacDonell Ranges can be seen in the upper section of the image and part of the Petermann Ranges are shown in the lower section. The crater is around 200 km west of Alice Springs, famous for being the gateway to the Red Centre, Australia's interior desert region. Asteroid Day brings people from around the world 1 / 2 APA citation: Image: Australian crater (2018, June 29) retrieved 2 October 2021 from https://phys.org/news/2018-06-image-australian-crater.html This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. 2 / 2 Powered by TCPDF (www.tcpdf.org).

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Cross-References ASTEROID IMPACT Definition and Introduction History of Impact Cratering Studies
18 ASTEROID IMPACT Tedesco, E. F., Noah, P. V., Noah, M., and Price, S. D., 2002. The identification and confirmation of impact structures on supplemental IRAS minor planet survey. The Astronomical Earth were developed: (a) crater morphology, (b) geo- 123 – Journal, , 1056 1085. physical anomalies, (c) evidence for shock metamor- Tholen, D. J., and Barucci, M. A., 1989. Asteroid taxonomy. In Binzel, R. P., Gehrels, T., and Matthews, M. S. (eds.), phism, and (d) the presence of meteorites or geochemical Asteroids II. Tucson: University of Arizona Press, pp. 298–315. evidence for traces of the meteoritic projectile – of which Yeomans, D., and Baalke, R., 2009. Near Earth Object Program. only (c) and (d) can provide confirming evidence. Remote Available from World Wide Web: http://neo.jpl.nasa.gov/ sensing, including morphological observations, as well programs. as geophysical studies, cannot provide confirming evi- dence – which requires the study of actual rock samples. Cross-references Impacts influenced the geological and biological evolu- tion of our own planet; the best known example is the link Albedo between the 200-km-diameter Chicxulub impact structure Asteroid Impact Asteroid Impact Mitigation in Mexico and the Cretaceous-Tertiary boundary. Under- Asteroid Impact Prediction standing impact structures, their formation processes, Torino Scale and their consequences should be of interest not only to Earth and planetary scientists, but also to society in general. ASTEROID IMPACT History of impact cratering studies In the geological sciences, it has only recently been recog- Christian Koeberl nized how important the process of impact cratering is on Natural History Museum, Vienna, Austria a planetary scale.
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Remote Sensing of Impact Craters 195
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