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cover of May 30, 2015 issue

Earth & Sky

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Despite a serious broiling and boiling, there was no foiling early life

Huge asteroid impacts around 3.3 billion years ago boiled Earth’s oceans, new research suggests. Condensing rock vapor from the impacts left spherical bits of rock the size of BB pellets in the rock record, shown here. The U.S. nickel (left) is for scale.

The opah is the fish closest to the whole-body warm-bloodedness typical of mammals and birds. This trait may give the species an edge in the ocean’s cold depths.

This opah is about as close to a full-body warm-blooded fish as science has yet discovered. Here, biologist Nick Wegner prepares to insert a temperture sensor into the animal’s pectoral muscles. The device will record internal and external temperatures following the fish’s release.

Dana Arabiyat, 15, of Amman, Jordan, designed a satellite (model shown) to collect and dispose of the space trash that threatens other satellites orbiting Earth.

Dana Arabiyat, 15, of Amman, Jordan, designed a satellite (model shown) to collect and dispose of the space trash that threatens other satellites orbiting Earth.

Earth & Sky

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