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Apollo 8 astronauts Frank Borman, Jim Lovell, and Bill Anders became the first humans to orbit the Moon, and the first to witness the magnificent sight called "Earthrise." NASA’s Chief Scientist and Senior Climate Advisor Dr. Katherine Calvin sat down with Bill Anders to discuss the historic Earthrise photo. To learn about how NASA continues to study the Earth

On May 9, 2016, Mercury passed directly between the Sun and Earth, making a transit of the Sun. Mercury transits happen about 13 times each century. NASA's SDO studies the Sun 24/7 and captured the eight-hour event. The images of Mercury's journey across the Sun were taken in a wavelength of extreme ultraviolet light.