Meet NASA scientist Lynn Carter, who studies the geology of planetary surfaces, in this video adapted from NASA's Goddard Space Science Center. Carter describes how scientists learn about Earth by studying other planets and moons. Objects such as the Moon have older surfaces, which serve as a record of early solar system conditions, because they have not been subject to Earth's tectonic and erosive processes. Carter explains various aspects of her work, including image analysis, writing, field work, and the use of radar to penetrate through surfaces to see hidden features on Earth, Mars, and the Moon.
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Earth is surrounded by electrons that can be disruptive to our technology. NASA is using high-altitude balloons and spacecraft to monitor and understand these particles in the radiation belts surrounding our planet.
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On the evening of March 18 (2018), step outside for a view of the crescent Moon, Venus, and Mercury together above the twilight horizon.
Explore how astronomers and scientists use astronomical units to measure distances in the solar system in this video adapted from NASA. The astronomical unit (au) -- equal to the average distance from Earth to the Sun -- is a convenient unit of measure when talking about distances in the solar syste