Prepping for the really big upcoming mission to the Hubble in May, the astronauts acquaint themselves with activities to be undertaken in a clean room. Pictured here the crew goes over various tasks.

Image at left: During the January crew familiarization activities at NASA’s Goddard Space Flight Center, Goddard EVA Manager Mark Jarosz (left) looks on as astronauts Andrew Feustel, John Grunsfeld, and Mike Massimino get familiar with the replacement Science Instrument Command & Data Handler (SIC&DH) unit, which will be installed on Hubble during Servicing Mission 4 in May.   Image Credit: NASA/Chris Gunn