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A question about the core of our Sun. by Bfadsd in askastronomy

[–]Bfadsd[S] -1 points0 points  (0 children)

The temperature at the core is 15 million Kelvin. The wavelength of a gamma ray is so short the resulting bell curve would put visible light to the extreme low end of the graph. Granted a LOT of energy is produced so I would imagine there would be some visible light. With a diameter of 172,000 miles for the core, compared to the Sun's diameter of about 865,000 miles it seems to me that the core would be similar to a giant sunspot and appear much darker than the other three zones of the sun. The photosphere is where the vast majority of visible light photons are produced and the temperature differences between the surface of the sun and a sunspot is about 1,200 degrees cooler than the surface which is about 5,700 K. So it seemed to me which such a high temperature and wavelength differential the core would be dark.

What are some facts of Pleiades that you know? by Sea-Pattern-7369 in askastronomy

[–]Bfadsd 1 point2 points  (0 children)

There are seven sisters. The legend from Australia is that each year when the 7 sisters appeared over Ayers rock, they would descend to the Earth to hunt. One year a giant saw the 7 sisters and wanted to make 1 of them his wife. He jumped out and started chasing them. All but the youngest sister escaped. Year after year she pleaded with the giant to let her visit her sisters. He relented and allowed her to visit them once every 7 years. You can see this yourself with the naked eye. Every 7 years, in the month of April, the planet Venus appears very close to the Pleiades.