Skip to main content

Posted by Specola

NASA Astronomy Picture of the Day:

Point your telescope at tonight's first quarter Moon. Along the terminator, the shadow line between night and day, you might find these two large craters staring back at you with an owlish gaze. Alphonsus (left) and Arzachel are ancient impact craters on the north eastern shores of Mare Nubium, the lunar Sea of Clouds. The larger Alphonsus is over 100 kilometers in diameter. A low sun angle highlights the crater's sharp 1.5 kilometer high central peak in bright sunlight and dark shadow. Scouting for potential Apollo moon landing sites, the Ranger 9 spacecraft returned closeup pictures of Alphonsus before it crashed in the crater just northeast (toward the upper left) of its central mountain in 1965. Alpetragius, between Alphonsus and Arzachel, is the small crater with the deeply shadowed floor and overly large central beak.

Photo by Noel Donnard

Powered by Volunteers | 360-794-7959

Click the Image to learn more about us

Read more from Kudos 365

Giving Kids in Need the Chance to Read
  Non-profit organization - Seattle, WA

Hunger impacts all of us | 360-435-1631

Snohomish, Skagit and Island County

Read more from Pepe's Painting LLC
Feedback