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The Sun's corona is much hotter (by a factor from 150 to 450) than the visible surface of the Sun: the corona's temperature is 1 to 3 million kelvin compared to the photosphere's average temperature – around 5 800 kelvin. The corona is far less dense than the photosphere, and produces about one-millionth as much visible light.
The Sun is a 4.6 billion year-old G-class (G2V) star and is more massive than 95% of all stars. Only 7.6% are G-class stars. The stars below are more similar to the Sun and having the following qualities: [1] Temperature within 50 K from that of the Sun (5728 to 5828 K) [a] (within 10 K of sun (5768–5788 K)).
They can only be seen when the sun is lower in the sky, so be sure to look for a fogbow the next time you head outside on a foggy day. A large lenticular cloud over the peak of Mt. Rainier ...
By combining data from both sky surveys, astronomers were able to piece together details of this intergalactic heating. A look at how temperatures changed (top) as the cosmic web collapsed to its ...
Of the main-sequence star types, stars more massive than 1.5 times that of the Sun (spectral types O, B, and A) age too quickly for advanced life to develop (using Earth as a guideline). On the other extreme, dwarfs of less than half the mass of the Sun (spectral type M) are likely to tidally lock planets within their habitable zone, along with ...
The total solar eclipse has come and gone, but sky-gazers have reason to keep looking up — a meteor shower will peak this week right before a full moon rises. The bright orb may steal some of ...
The star has a diameter of around 36 million km, making it about 26 times larger than the Sun. [10] Despite this size difference, the mass of Arcturus is only 1.1 times that of the Sun. With its high speed of 122 km/s (270,000 mph) and a path which crosses the galactic plane rather than residing within it, Arcturus may have formed outside of ...
Spots as small as sunspots have not been detected on other stars, as they would cause undetectably small fluctuations in brightness. The commonly observed starspots are in general much larger than those on the Sun: up to about 30% of the stellar surface may be covered, corresponding to starspots 100 times larger than those on the Sun.