Planetary parade: Mercury falls into line for rare seven-planet alignment
by Guardian staff and agencies from Science | The Guardian on (#6VK2J)
The seven will appear to form a straight line in the night sky in display that won't be seen again until 2040
Seven planets will appear to align in the night sky on the last day of February in what is known as a planetary parade.
These planetary hangouts happen when several planets appear to line up in the night sky at once.
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