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Features as small as 30km (18 miles) in size are observable for the first time. The image shows a pattern of turbulence of solar plasma, a super-heated gas. The cell-like structures, each about the size of Texas (approximately 700'000km 2), are the signature of a dynamic activity of heat from the inside of the sun to its surface. The solar ...
Earth_seen_from_the_sun.ogv (Ogg multiplexed audio/video file, Theora/Vorbis, length 29 s, 640 × 480 pixels, 244 kbps overall, file size: 879 KB) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
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Pale Blue Dot is a photograph of Earth taken on February 14, 1990, by the Voyager 1 space probe from an unprecedented distance of approximately 6 billion kilometers (3.7 billion miles, 40.5 AU), as part of that day's Family Portrait series of images of the Solar System.
The Sun is the star at the center of the Solar System.It is a massive, nearly perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy from its surface mainly as visible light and infrared radiation with 10% at ultraviolet energies.
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If the extraterrestrial solar radiation is 1,367 watts per square meter (the value when the Earth–Sun distance is 1 astronomical unit), then the direct sunlight at Earth's surface when the Sun is at the zenith is about 1,050 W/m 2, but the total amount (direct and indirect from the atmosphere) hitting the ground is around 1,120 W/m 2. [6]
At the equator, the solar rotation period is 24.47 days. This is called the sidereal rotation period, and should not be confused with the synodic rotation period of 26.24 days, which is the time for a fixed feature on the Sun to rotate to the same apparent position as viewed from Earth (the Earth's orbital rotation is in the same direction as the Sun's rotation).