An artistic photograph by Omar Z. Robles of a ballerina in pointe shoes dancing in a street devastated by hurricanes and floods in Puerto Rico

If you need a break from the heat, there are several exhibitions around Columbia that you can enjoy while cooling off indoors.

In a new study, astronomers show how gas expelled in the merger of two small galaxies can linger across vast distances for billions of years, where it may eventually feed gas to more massive galaxies to make new stars. The Large Magellanic Cloud and the Small Magellanic Cloud pictured above are a pair of dwarf galaxies that were in the process of merging when they fell into the Milky Way. Their gas is expected to replenish half of the gas consumed by our galaxy as it forms new stars. (Photo: S. Brunier/European Southern Observatory)

 

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Stephen Sestanovich
Before the Russia-U.S. summit in Helsinki, Russia expert Steve Sestanovich assessed the Trump-Putin relationship, and what they seek from one another.

Researchers set out four microphones like this one in the foothills of Alaska's Brooks Range to record songbird calls over five breeding seasons. In a new study, they describe an automated tool for sifting through thousands of hours of recordings to estimate when migratory birds arrive en masse in the Arctic. (Photo credit: Heather Greaves)

In a new study, scientists describe a way to quickly sift through thousands of hours of field recordings to estimate when songbirds arrive at their Arctic breeding grounds. Their research could be applied to any dataset of animal vocalizations to understand how migratory animals are responding to climate change.
Mae Ngai
Author of the award-winning book 'Impossible Subjects: Illegal Aliens and the Making of Modern America,' Ngai is an authority on immigration, citizenship, nationalism, and U.S. legal and political history.
Charles Armstrong
Armstrong is the Korea Foundation Professor of Korean Studies in the Social Sciences at Columbia and the author of five books on the two countries.