Suggested Searches

APOD

Astronomy Picture of the Day

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.

See Explanation. Clicking on the picture will download the highest resolution version available.

Plane Crossing a Crescent Moon

Explanation: No, this is not a good way to get to the Moon . What is pictured is a chance superposition of an airplane and the Moon. The contrail would normally appear white, but the large volume of air toward the setting Sun preferentially knocks away blue light , giving the reflected trail a bright red hue. Far in the distance, well behind the plane, is a crescent Moon , also slightly reddened. Captured a month ago above Valais , Switzerland , the featured image was taken so soon after sunset that planes in the sky were still in sunlight, as were their contrails . Within minutes, unfortunately, the impromptu sky show ended. The plane crossed the Moon and moved out of sight. The Moon set . The contrail became unilluminated and then dispersed.

Date February 12, 2019
Credit Image Credit & Copyright: Olivier Staiger ( Binounistan.com )
Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
A service of: ASD at NASA / GSFC,
NASA Science Activation & Michigan Tech. U.