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Apollo 11 astronauts took this photo of Earth on July 20, 1969.

28 iconic photos of the Earth from space that will make you feel puny and insignificant

Carl Sagan, whose birthday is November 9, famously juxtaposed human history as a struggle upon a mote of cosmic dust in his book "Pale Blue Dot."

Apple’s latest ad explains why our planet is so important

Apple's new ad features the voice of astronomer Carl Sagan explaining why our planet is so important.

Awe-inspiring quotes from Carl Sagan reveal how we are fundamentally connected to the cosmos

Stop and marvel at the grand universe in which we live, and you will learn something about yourself.