Nobody knows it, but the universe has a secret smile, and it uses it only for Earth.

See a cosmic 'smiley face' in the early morning sky as the moon greets Saturn and Venus tomorrow

Source: space
Source Link: https://www.space.com/stargazing/see-a-cosmic-smiley-face-in-the-early-morning-sky-as-the-moon-greets-saturn-and-venus-tomorrow