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See 6 Planets Align on January 21
Alignments of five or more planets are rare—there will be two more featuring five or more planets this year, but after that the next won’t happen until 2040.
But if you miss the chance to observe the night sky on January 21, don’t worry: There is plenty of time to see this planetary parade. You’ll want to see this planetary alignment after the sun has set and from a location far away from artificial light, which makes it hard to see objects in the night sky. Mars has just reached opposition—meaning the Earth is directly between it and the sun—so the Red Planet will appear at its biggest and brightest and will be visible all night.
Or read this on Wired
