Saturn and Jupiter will come the closest they have done in hundreds of years, creating a "Christmas star" in what will be a super rare occurrence.
The two planets will create a "spectacular event in the sky” on Monday night as they happen to meet in a combined patch of the sky, giving the appearance of one star.
While the planets will actually still be roughly 400 million miles from one another, to the naked eye on Earth they will appear as one bright eye object.
The last time Jupiter and Saturn were this close together and visible was in 1226 AD. Because of its appearance this year on the winter solstice, it is being described as the 'Christmas Star' in reference to the story of Jesus' birth.
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