How is it that the moon appears to be exactly the same size as the sun, when both are observed from Earth? Objects that are closer to you appear to be larger. In the case of an eclipse, the sun is about 400 times larger than the moon, but the sun is also about 400...
As a geologist and climate change expert at the National Geographic Society, I am thrilled to be on Santa Cruz Island in the Galápagos this week. We are on the equator, 600 miles from the coast of Ecuador, and it is nothing short of amazing. The Galápagos Islands are a living laboratory for science and...