About Dan I am a Caltech postdoc working at NASA's Jet Propulsion Laboratory in Pasadena, CA. While we all may be made of star stuff, we find that the universe is mostly made of something very different: dark matter. By analyzing an effect called "gravitational lensing", I along with other astronomers help us see all we've been missing. Since my beginnings in grad school, I have been spoiled by access to beautiful Hubble images. As a member of the Advanced Camera for Surveys (ACS) science team at Johns Hopkins University (including time at the Andalusian Astrophysics Institute (IAA) in Granada, Spain), I mapped the dark matter of galaxy clusters and measured the distances to thousands of galaxies in the Hubble Ultra Deep Field. Most recently I have studied how gravitational lenses delay images in reaching our telescopes. Measurements of these delays can trace the expansion history of the universe, placing constraints on Hubble's constant and the nature of dark energy.
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