It's time again for the Perseid meteor shower, when the earth passes through a cloud of debris from Swift-Tuttle comet. The shower is expected to peak tonight and tomorrow night, and should be seen decently from Chicago, as the moon is in in its crescent phase and its light will not interfere.

Chicago Astronomer suggests "start looking to the East/Northeast at dusk; this is when "Earth Grazers" skim the atmosphere like a rock across a pond and can produce great fireballs. You'll see more as the evening progresses, especially after midnight as we run directly head on into the debris field." The most meteors should be visible around 2am. Related: The Adler Planetarium has a newsletter, What's up in the sky this month?