A rare show fro astronomers.
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As the Sun set on Memorial Day 2013, people were able to look to the west and see planetary neighbors Mercury, Venus, and Jupiter performing the celestial dance known as a planetary conjunction. Observers did not need any special equipment; the planets were bright enough for the human eye to suffice.
While an unobstructed view was necessary to catch the planets in their splendorâ€”pollution does not count, as the light of the planets is bright enough to pierce throughâ€”all three bodies could be seen in this conjunction, also called a planetary trio. According to EarthSky.org, a planetary trio consists of any three planets that are less than 5 degrees from each other.