Earth Day celebrates its 55th birthday today. Since 1970, April 22 has become a day to reflect on the environment, and for people to share their concerns for the planet. Founded by a US senator ...

The curious thing about the images is the difference in the way the two men perceived what they were seeing. Frank Borman related the 'Earthrise ... with planet Earth a little to the left but ...

Viewed more than 33 million times, the post shares a photo of the planet not commonly seen. Most images of the Earth show the Northern Hemisphere of the planet, as this half of the globe is home ...