How does a galaxy evolve — and how do we know what we know about that process? James Geach is here to take all of our questions about the process and the observation of galaxy formation.

Geach recently published a new book Galaxy: Mapping the Cosmos focusing on the evolution of galaxies, and the ways in which we study them.

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He holds a PhD from Durham University and is a Royal Society University Research Fellow at the Centre for Astrophysics Research (CAR) at the University of Hertfordshire. Besides the evolution of galaxies, his research also focuses on understanding some of the hidden activities of galaxies, parsing out the role of the environment in galaxy formation, and the role of cold gas in the process.

Geach will be joining us from noon - 1 P.M. today, so start asking him all your questions now about the formation of galaxies and all that we can (and can't) learn from observation.

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Image: A long exposure shot from the Hubble of galaxy cluster Abell 2744, featuring some of the youngest galaxies ever seen / NASA, ESA, and J. Lotz, M. Mountain, A. Koekemoer, and the HFF Team (STScI)