From the blog page:
Even in modern times, transits are useful. We look for planets orbiting other stars using a similar method, watching for a dip in the light as the planet blocks the star. To help refine this method, astronomers will use Hubble (!) to look at the Moon (!) ? since the Moon is lit by the Sun, the tiny drop in sunlight during the transit should dim the Moon a bit. They?re actually hoping to see if they can detect Venus?s atmosphere too, since that will affect how the light g
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