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Physics Colloquium, May 31, 2005Interstellar Dust: From Microwaves to X-raysBruce T. DrainePrinceton UniversityDust grains play a variety of critical roles in astrophysics. On a superficial level, they determine what galaxies look like. On a more fundamental level, they have much to do with how galaxies work. Our knowledge of interstellar grains is progressing, mainly due to observational advances, but much remains uncertain. I will review some of what we think we know about interstellar grains based on observations from microwaves to X-rays. One major uncertainty concerns the geometry of interstellar grains -- are they compact or are they fluffy? I will discuss current theoretical work to address this question. 3.30 p.m., Robert Smith Seminar Room, 1080 PRBReception served at 3:00 p.m., Atrium, PRB |
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