Hello, Summer Triangle: A new season brings sky watchers a dominant stellar pattern. The Summer Triangle is known as an asterism, an eye-catching pattern that can include stars from multiple constellations. In this case the Summer Triangle is formed by the stars, Vega in Lyra, the harp; Altair, in Aquila, the eagle; and Deneb, from Cygnus, the swan. The Milky Way band cuts right across the formation. At dawn Friday, look in the low eastern sky for a stunning lineup of worlds that includes the crescent moon sandwiched between Venus and Mars. Here’s more on summer’s rare planetary lineups. — Andrew Fazekas
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