Happy Earth Day

Earthrise, Apollo VIII, December 22, 1968
Earthrise, Apollo 8

I remember when we first received images of the earth from space. This image, taken by Apollo VIII astronauts returning to Earth after circumnavigating the moon, was not the first. But, showing the green, wet, full-of-life, and finite Earth in stark contrast to the dry, lifeless Moon, it helped energize the environmental movement.

The rising Earth is about five degrees above the lunar horizon in this telephoto view taken from the Apollo 8 spacecraft near 110 degrees east longitude. The horizon, about 570 kilometers (250 statute miles) from the spacecraft, is near the eastern limb of the Moon as viewed from the Earth. On the earth, the sunset terminator crosses Africa. The south pole is in the white area near the left end of the terminator. North and South America are under the clouds. The lunar surface probably has less pronounced color than indicated by this print.
– NASA Earth Observatory

We Are All One World

NASA images by Reto Stöckli, based on data.
The Earth, Side B

Spectacular composite images from NASA. If you have the bandwidth, definitely check out the full size renditions (Eastern hemisphere, and my home, the Western hemisphere), each of which is nearly 3MB in size. You’ll feel like you’re floating in space over the earth.

These are not photographs. These are carefully constructed from large databases of images taken at many different times and places.

Drawing on data from multiple satellite missions (not all collected at the same time), a team of NASA scientists and graphic artists created layers of global data for everything from the land surface, to polar sea ice, to the light reflected by the chlorophyll in the billions of microscopic plants that grow in the ocean. They wrapped these layers around a globe, set it against a black background, and simulated the hazy edge of the Earth’s atmosphere (the limb) that appears in astronaut photography of the Earth.

Most of the data layers in this visualization are available as monthly composites as part of NASA’s Blue Marble Next Generation image collection. The images in the collection appear in cylindrical projection (rectangular maps), and they are available at 500-meter resolution. The large images provided above are the full-size versions of these globes. In their hope that these images will inspire people to appreciate the beauty of our home planet and to learn about the Earth system, the developers of these images encourage readers to re-use and re-publish the images freely.

Twin Blue Marbles, NASA Earth Observatory


Links

Blue Marble: Next Generation