Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
2013 March 3
Explanation: One of the natural wonders of planet Earth, the Grand Canyon in the American southwest stretches across this contemplative evening skyscape. The digitally stacked sequence reveals the canyon's erosion-carved layers of sedimentary rock reflecting the moonlight. The exposed sedimentary rock layers range in age from about 200 million to 2 billion years old, a window to history on a geological timescale. With the camera fixed to a tripod while Earth rotates, each star above carves a graceful arc through the night sky. The concentric arcs are centered on the north celestial pole, the extension of Earth's rotation axis into space, presently near the bright star Polaris.
Authors & editors:
Jerry Bonnell (UMCP)
NASA Official: Phillip Newman Specific rights apply.
A service of: ASD at NASA / GSFC
& Michigan Tech. U.