Hubble Space Telescope times-series photometry of the planetary transit of HD189733: no moon, no rings, starspots

Well, nobody really expected them to exist as any orbit would be unstable so close to the star. The planet was detected transiting huge starspots, which is very cool.

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Science is a way of trying not to fool yourself. The first principle is that you must not fool yourself, and you are the easiest person to fool.
-- Richard Feynman