Skip to main content

Posted by Specola

NASA Astronomy Picture of the Day:

How does the sky turn dark at night? In stages, and with different characteristic colors rising from the horizon. The featured image shows, left to right, increasingly late twilight times after sunset in 20 different vertical bands. The picture was taken last month in Syracuse, Sicily, Italy, in the direction opposite the Sun. On the far left is the pre-sunset upper sky. Toward the right, prominent bands include the Belt of Venus, the Blue Band, the Horizon Band, and the Red Band. As the dark shadow of the Earth rises, the colors in these bands are caused by direct sunlight reflecting from air and aerosols in the Earth's atmosphere, multiple reflections sometimes involving a reddened sunset, and refraction. In practice, these bands can be diffuse and hard to discern, and their colors can depend on colors near the setting Sun. Finally, the Sun completely sets and the sky becomes dark. Don't despair -- the whole thing will happen in reverse when the Sun rises again in the morning.

Photo by Dario Giannobile

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

Click the Image to learn more about us

Snohomish, Skagit and Island County

Read more from Pepe's Painting LLC

FLO JAPANESE RESTAURANT
425-453-4005 - 1150 106th Ave NE Bellevue, WA 98004

Hunger impacts all of us | 360-435-1631