A rare 6-planet alignment will occur soon. Here's what to know.
The orbits of six planets will bring them to the same side of the sun to create a "planetary parade" in early June.
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The orbits of six planets will bring them to the same side of the sun to create a "planetary parade" in early June.
Astronomers have spotted a large and mysterious dark spot within Neptune's atmosphere, and it has an unexpectedly bright companion.
