The Earth reflects 29% of the visible light that hits it. The Earth is 1.5 x 108 km away from the Sun, and its radius is 6378 km. If you were gazing at our solar system from around some distant star using visible light, how much brighter would the Sun appear to be than the Earth? (hint: what fraction of the Sun's light does the projected disk of the Earth intercept?) Comment on why it might be difficult to detect the Earth in the immediate presence of the Sun.