Across the Universe: View from afar

This column first ran in The Tablet in February 2013 I traveled to Tucson to measure the fluctuating brightness of some small bodies in the outer solar system using the Vatican’s Advanced Technology Telescope. By how often they brighten and dim, we measure how fast these bodies spin; by how much their brightness changes during these cycles, we get a measure of their irregular shapes. It is not particularly thrilling work. We point the telescope at a given object; take a three-minute exposure with our electronic camera; and then another exposure; and another; and another… These objects typically take about eight hours or more per spin; so we observe one body per night as it rises, crosses the sky, and sets in the west… checking the images for clarity, tweaking the focus, watching the skies to make sure that clouds are not moving in. (We got three clear nights out of five.) Data in hand, our work is still … Continue reading →

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