MESSENGER Reveals Mercury in New Detail 16 January 2008

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MESSENGER Reveals Mercury in New Detail 16 January 2008 It is already clear that MESSENGER’s superior camera will tell us much that could not be resolved even on the side of Mercury viewed by Mariner’s vidicon camera in the mid-1970s. This MESSENGER image was taken from a distance of about18,000 kilometers (11,000 miles), about 56 minutes before the spacecraft's closest encounter with Mercury. It shows a region roughly 500 kilometers (300 miles) across, and craters as small as 1 kilometer (0.6 mile) can be seen in this image. Source: JHU/APL Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington As MESSENGER approached Mercury on January 14, 2008, the spacecraft’s Narrow-Angle Camera on the Mercury Dual Imaging System (MDIS) instrument captured this view of the planet’s rugged, cratered landscape illuminated obliquely by the Sun. The large, shadow-filled, double ringed crater to the upper right was glimpsed by Mariner 10 more than three decades ago and named Vivaldi, after the Italian composer. Its outer ring has a diameter of about 200 kilometers (about 125 miles). MESSENGER’s modern camera has revealed detail that was not well seen by Mariner 10, including the broad ancient depression overlapped by the lower-left part of the Vivaldi crater. The MESSENGER science team is in the process of evaluating later images snapped from even closer range showing features on the side of Mercury never seen by Mariner 10. 1 / 2 APA citation: MESSENGER Reveals Mercury in New Detail (2008, January 16) retrieved 3 October 2021 from https://phys.org/news/2008-01-messenger-reveals-mercury.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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Jack Wright1, David A. Rothery1, Matt R. Balme1 and Susan J. Conway2
Late-stage effusive volcanism on Mercury: Evidence from Mansurian impact basins Jack Wright1, David A. Rothery1, Matt R. Balme1 and Susan J. Conway2 1The Open University, Milton Keynes, MK7 6AA, UK Email: [email protected] 2LPG Nantes - UMR CNRS 6112 Université de Nantes, France Introduction Young, post-impact volcanism Fig. 1. Time systems of Mercury and ? Widespread Volcanism ? conventional absolute model ages. We are looking for geological evidence for volcanism in Mansurian impact basins Tolstojan Tolstojan [1] (>100 km). This will tell us about how plains volcanism ended on Mercury Calorian during an era of global cooling and contraction [2]. Within the Mansurian, we Pre- Hermean predict that older, larger basins host more volcanism than younger, smaller ones. Kuiperian MANSURIAN System We expect there came a time when impacts could no longer liberate magma from Mercury's interior, marking the end of effusive volcanism. Time before 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 present (Ga) Colour Boundaries Pyroclastics & Edifice Shield volcano talk tomorrow in Waterway 1 @ 10.00 am! 18°E 20°E 22°E 54°E 56°E 58°E 52°E 56°E 60°E 120°E 122°E 124°E 123°E A B C A B D 1000 34°S ± 800 30°N ± 600 ± 2020 kmkm 400 8°S ± ± 200 14°S 34°S 0 C 0 5 10 15 20 25 30 relative relative elevation m / 34°S 26°N ± A distance along profile / km A' 10°S 2020 kmkm 200200 kmkm 100100 kmkm 36°S 123°E 16°S -5 km Mercury global topography +4 km 100100 kmkm 100100 kmkm Fig.
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