The Boston Globe has posted some breathtaking pictures of Jupiter and its moons from various NASA space missions dating back to 1979. A few of the pictures try to give a good sense of just how big Jupiter is, but I don't think the human mind can really comprehend it fully. One photo, for instance, shows the Great Red Spot, saying it's 20,000 km across. The diameter of the Earth is roughly 12,756 km, meaning you could almost fit two Earths side-by-side in it. The picture itself was taken from over two million km away. Crazy.