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Graphic shows the masses for black holes detected through gravitational-wave observations (blue).
The Aurora Australis, or Southern Lights, over the South Pole Telescope.
The Robert C. Byrd Green Bank Telescope in Green Bank, West Virginia.
Utah's Rainbow Bridge, part of the study, is one of the world's largest natural arches.
Scientists Jeff Moore (right) and Paul Geimer install a seismometer at Owachomo Bridge in Utah.
The seismometer allows for comparison of vibrations on the bridge and in adjacent bedrock.
Researcher Ben White near the top of Corona Arch in Utah, after placing a seismometer there.
A seismometer rests at the base of Rainbow Bridge. It will measure vibrations over several hours.
A team of geologists accesses the top of Rainbow Bridge for a seismic vibration measurement.
Sierra Nevada Mountain forests receive a large percentage of their nutrients from windborne dust.
Scientists sampled live pine needles to measure nutrients from dust and from bedrock.