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The Moon, Venus, and Saturn are expected to briefly align into a rare formation resembling a "smiley face" this week, Nasa has said. Skygazers will be able to see the two planets and the crescent Moon ...

The moon will be at its last quarter, which means it will appear about half-full on April 21, and won't rise until about 3:30 a.m., leaving most of the night moon-free. That means meteors won't be ...