Opsomming

Below is an official NASA caption for an image made about one month before the image on this Wikimedia Commons page:

(Source: https://sdo.gsfc.nasa.gov/gallery/main/item/580 )

The most dominant feature on the Sun the past week has been quite a large, dark coronal hole at the bottom of the Sun (Nov. 30 - Dec. 4, 2014). Coronal hole are areas where the Sun's magnetic field is open ended and where high-speed solar wind streams into space. The area appears darker there because there is less material being imaged in this wavelength of extreme ultraviolet. At its widest point, the hole extends more than 50 times the size of Earth. The video covers almost five days of activity. Credit: Solar Dynamics Observatory, NASA.

Lisensiëring

	This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
	Warnings: Use of NASA logos, insignia and emblems is restricted per U.S. law 14 CFR 1221. The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain. Materials based on Hubble Space Telescope data may be copyrighted if they are not explicitly produced by the STScI.[1] See also {{PD-Hubble}} and {{Cc-Hubble}}. The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2] Images featured on the Astronomy Picture of the Day (APOD) web site may be copyrighted. [3] The National Space Science Data Center (NSSDC) site has been known to host copyrighted content. Its photo gallery FAQ states that all of the images in the photo gallery are in the public domain "Unless otherwise noted."