NEW YORK (AP) — Two bright green comets are streaming through the skies and are visible to skygazers in the Northern Hemisphere.

Both hail from the outer edges of our solar system — possibly what's known as the Oort Cloud , well beyond Pluto. Comet Lemmon will have its closest brush with Earth on or around Tuesday. The other cosmic snowball, Comet SWAN, should have its flyby with Earth on Monday, but it's headed away from the sun and will likely grow dimmer as the days pass.

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