Earth from Saturn
What's that pale blue dot in this image taken from Saturn? Earth . The robotic Cassini spacecraft looked back toward its old home world earlier this month as it orbited Saturn . Using Saturn itself to block the bright Sun , Cassini imaged a faint dot on the right of the above photograph . That dot is expanded on the image inset, where a slight elongation in the direction of Earth's Moon is visible . Vast water oceans make Earth's reflection of sunlight somewhat blue . Earth is home to over six billion humans and over one octillion Prochlorococcus .