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Exactly four hundred years ago today (ignoring the effect of calendar reform) Galileo first spied three stars close to Jupiter: two to the east and one to the west. On his first sighting he could not, of course, note anything unusual (his telescope could see millions of stars), but they caused him surprise because they were in a straight line parallel to the ecliptic.
Come back tomorrow to see what happened next!
Links and acknowledgement can be found on blogs below
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