Earthlings can now observe a rare celestial gathering: Mercury, Venus, Mars, Jupiter and Saturn are all in alignment in our sky — and will continue to be for around a month. The last time the five paraded in a line was December 2004 to January 2005. From January 20 to February 20 sky-gazers can see the five planets almost literally lined up, as their positions along the ecliptic (the sun’s perceived path in our sky) form a diagonal line.

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