Thursday, Aug. 21, offers a final chance for early-rising skywatchers to glimpse this week’s spectacular “planet parade.” On display since the weekend, the match-up of the crescent moon with Mercury, Venus, Jupiter and Saturn — as well as Neptune and Uranus (though not visible to the naked eye) — reaches its end with a final flourish. Although it may be challenging to see, a very slender crescent moon will shine close to Mercury, with a stunning star cluster visible between the two.
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