Martin Ratcliffe

The Stratospheric Observatory for Infrared Astronomy (SOFIA)

Cool Comets

Beginner's Guide to Observing Jupiter

SOFIA – Flight Tests and the Promise of New Science

Encore: Cool Comets, by Martin Ratcliffe

NASA’s Flying Observatory Begins Science Flights, by Martin Ratcliffe

365 Days of Astronomy 2009 - 365 090131 SOFIA [A2]

365 Days of Astronomy 2009 - 365 090304 Cool Comets

NASA’s Flying Observatory Begins Science Flights

Encore: Cool Comets