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By Astronomy Cast on January 2, 2017 in

Mars is a world of extremes. This unassuming red world is home to the largest and tallest volcanoes in the entire solar system. In fact, it’s not even a close contest, with Olympus Mons rising 22 kilometers above the surrounding plains. More than twice as tall as Mount Everest. How did Mars get such big volcanoes? And how active is the planet today

By Martin Ratcliffe on August 26, 2009 in

Date: August 26, 2009 Title: 20th Anniversary of Voyager 2 at Neptune Podcaster: Martin Ratcliffe and Dr. Ed Stone Organization: None Description: In August 1989, the Voyager 2 spacecraft performed the first reconnaissance with the solar system’s outermost major planet, Neptune. Now, 20 years later, the Voyager mission Project Scientist, Dr. Ed Stone, joined me […]