This close-up view shows the docking mechanism of the ISS Progress M-21M (53P) resupply craft as it undocks from the International Space Station's Zvezda Service Module aft port at 9:29 a.m. (Eastern Daylight Time) on June 9, 2014.
NASA on The Commons
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/nasacommons/35066308691/in/feed">Flickr</a>