O ▪ Oört Cloud  -  A vast spherical region at the outer reaches of our solar system where perhaps as many as one trillion little (3 km) comet nuclei are slowly orbiting the Sun, waiting for their big chance to be bumped out of their big circular orbit and plunge toward the Sun and glory. ▪ opposition - The alignment of a superior planet where that planet is seen in the exact opposite direction from the Sun in the night sky.  This means that the planet rises at sunset and sets at sunrise.  It’s the best time to view the planet because it is closest to Earth at that time.
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Glossary
Carpe Caelum