Nearly all of the planets in the solar system are about to march through the night sky in a single-file line. This planetary alignment, sometimes called a planet parade, will include all of the solar system’s planets except Mars, as it is currently on the opposite side of the sun from Earth and therefore not visible.
Alignments like this only occur every few years, when all the planets’ orbits happen to carry them to the same side of the sun at the same time. All of their orbits are different lengths – Mercury takes 88 Earth days to circle the sun while Neptune takes about 165 Earth years – so planetary alignments are a lucky coincidence of geometry and orbital dynamics.
Sometimes they happen…
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Source www.newscientist.com
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