Abstract 

  We live in a hot Universe. More than 80% of all normal matter is at temperatures above a half million degrees, where it can readily be observed only in X rays. Study of hot gas is needed to locate the "missing baryons" and verify standard theories of structure formation, to understand feedback regulation of star formation, and to understand metal transport in the intergalactic medium, from clusters and individual galaxies, and within our Galaxy. I will discuss the instrumental difficulties of making these observations, and progress being made in overcoming them.

  Prof. Dan McCammon has Professional Service in NASA Sounding Rocket Working Group, ASTRO-D International Advisor Committee, NAS Task Group on Space Astronomy and Astrophysics, NASA Structure and Evolution of the Universe Technology Working Group, NASA Astrophysics Working Group, AAS High Energy Astrophysics Division Executive Committee, High Energy from Space Panel of NAS 2000 Decadal Survey, NASA Structure and Evolution of the Universe Subcommittee, Host and co-chair for the 9th International Workshop on Low Temperature Detectors, NRC Ad HocCommittee on thereview of the NASA Science Mission Directorate Science Plan. Astro2010 Decadal Survey committee. Chair, Astrophysics Division of American Physical Society. NASA Senior Review. NASA Explorer proposal evaluation.  

 Awards and Recongnition: American Physical Society Fellow, Romnes Faculty Fellowship, Vilas Associate.