Ancients of Sea and Sky : They may look like round rocks, but they’re alive. Moreover, they are modern versions of one of the oldest known forms of life: stromatolites. Fossils indicate that stromatolites appeared on Earth about 3.7 billion years ago – even before many of the familiar stars in the modern night sky were formed. In the featured image taken in Western Australia, only the ancient central arch of our Milky Way Galaxy formed earlier. Even the Magellanic Clouds, satellite galaxies of our Milky Way and visible in the featured image below the Milky Way’s arch, didn’t exist in their current form when stromatolites first grew on Earth. Stromatolites are accreting biofilms of billions of microorganisms that can slowly move toward light. Using this light to liberate oxygen into the air, ancient stromatolites helped make Earth hospitable to other life forms including, eventually, humans. via NASA
Some of you have already seen this at con, but here is the first month of pin crate! Space kitty the exploring the universe with his donut spaceship :D if you are interested in getting a pin and a piece of artwork every month, sign up for my pin crate on patreon now!!
A Pileus Iridescent Cloud over Ethiopia. This is created when a group of water droplets of uniformly similar size diffract different colors of sunlight by different amounts. The image credit goes to Esther Havens.