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This lecture is the fifth in our series, Quarks to Quasars, and is given by Prof. Jayant Murthy, a senior professor at the Indian Institute of Astrophysics (IIA). He obtained his PhD from the Johns Hopkins University in 1987. His current research is focused on the interstellar medium (dust and gas between stars). He also builds instruments for space flight, the latest of which is a proposal to fly on the Chinese Space Station as part of a United Nations program. Although an important part of our Galaxy, interstellar dust is difficult to characterize. Historically, most of our information about dust has come from observations of extinction curves against background stars but these are limited to those directions where there are suitable stars. Infrared observations of the thermal emission from dust heated by the interstellar radiation field fills the sky and has yielded considerable information about the properties and the distribution of the dust. Ultraviolet observations of the scattered light from the dust have been difficult and sparse until the launch of the GALEX mission. Prof. Murthy will discuss his extraction of this diffuse light from the GALEX data and what it tells us about the properties of interstellar dust. His primary focus will be on the models he is working on and will talk about its successes and deficiencies. He will also present his group's latest results on the background at the Galactic poles where they have discovered a new component of the extragalactic radiation field, one for which they do not yet know the source. To look at the cosmos in a new light, join us live on October 18th at 4 PM! Any lecture is incomplete without questions, so post them in the live chat to have them answered firsthand by the speaker.