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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.

The picture shows the Sun rising over a hill in Perter, Spain, complete with sunspots and foreground trees. Please see the explanation for more detailed information.

Sun Spot Hill

Explanation: Is this giant orange ball about to roll down that tree-lined hill? No, because the giant orange ball is actually the Sun . Our Solar System's central star was captured rising beyond a hill on Earth twelve days ago complete with a delightfully detailed foreground. The Sun's disk showed five sunspots , quite a lot considering that during the solar minimum in solar activity of the past few years, most days showed no spots . A close look at the hill -- Sierra del Cid in Perter, Spain -- reveals not only silhouetted pine trees, but silhouetted people -- by coincidence three brothers of the photographer. The trees and brothers were about 3.5- kilometers away during the morning of the well-planned image. A dark filter muted the usually brilliant Sun and brought up great detail on the lower sunspots . Within a few minutes, the Sun rose far above the hill, while within a week, the sunspots rotated around the Sun, out of view. The captured scene, however, is now frozen in time for all to enjoy.

Date September 21, 2021
Credit Image Credit & Copyright: Jordi Coy
Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
A service of: ASD at NASA / GSFC,
NASA Science Activation & Michigan Tech. U.