A solid rocket motor for the United Launch Alliance Atlas V rocket is lifted at the mobile service tower at Space Launch Complex 41.

A solid rocket motor for the United Launch Alliance Atlas V rocket slated to boost NASA's Magnetospheric Multiscale mission, or MMS, is lifted at the mobile service tower at Space Launch Complex 41 on Cape Canaveral Air Force Station in Florida. Four identical MMS spacecraft will study the mystery of how magnetic fields around Earth connect and disconnect, explosively releasing energy via a process known a magnetic reconnection. Launch is set for March 12. To learn more: http://www.nasa.gov/mms. Photo credit: NASA/ Kim Shiflett