November 20, 2019 | 4:40 PM IST
science

ISRO releases images of impact craters on lunar surface was taken by Chandrayaan-2 orbiter

Indian Space Research Agency (ISRO), on Tuesday, released fresh images of the impact of craters on the Moon’s surface taken by its Chandrayaan-2 orbiter.  The images are helpful in studying the nature, size, distribution, and composition of impact craters and the material ejected as a result of the impact.  
The fresh set of pictures have been taken using Synthetic Aperture Radar (SAR), which is a powerful remote sensing instrument for studying planetary surfaces and subsurface. The images give several interesting insights about the secondary craters of different ages and origins in the south polar region of the Moon. Also, an image shows three similar-sized craters that can be identified as examples of a young crater, moderately weathered crater and an old degraded crater.
In a statement, ISRO said, “The yellowish tone around crater rims are the ejecta fields which indicate the nature of the impact.” It said that the Moon has been continuously struck upon, by meteorites, asteroids, and comets resulting in craters on its surface.
The release further read, “In contrast to volcanic craters, which result from explosion or internal collapse, impact craters typically have raised rims and floors that are lower in elevation than the surrounding terrain.”
Incidentally, NASA has failed to find any evidence of Chandrayaan-2’s Vikram lander in its latest images of the south pole region where India’s mission attempted a soft landing on September 7.

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