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[121] [122] Within 7.5 billion years, the Sun will have expanded to a radius of 1.2 AU (180 × 10 ^ 6 km; 110 × 10 ^ 6 mi)—256 times its current size. At the tip of the red-giant branch , as a result of the vastly increased surface area, the Sun's surface will be much cooler (about 2,600 K (2,330 °C; 4,220 °F)) than now, and its luminosity ...
The Sun then shrinks to around 10 times its current size and 50 times the luminosity, with a temperature a little lower than today. It will then have reached the red clump or horizontal branch, but a star of the Sun's metallicity does not evolve blueward along the horizontal branch. Instead, it just becomes moderately larger and more luminous ...
At that time, the core of the Sun will contract with hydrogen fusion occurring along a shell surrounding the inert helium, and the energy output will be greater than at present. The outer layers of the Sun will expand to roughly 260 times its current diameter, and the Sun will become a red giant. Because of its increased surface area, the ...
This solid sphere of iron and nickel is about 70% the size of the moon, with a radius of approximately 759 miles (1,221 kilometers). ... Earth will likely be obliterated as our sun expands into a ...
Despite the lower energy density of their envelope, red giants are many times more luminous than the Sun because of their great size. Red-giant-branch stars have luminosities up to nearly three thousand times that of the Sun ( L ☉ ); spectral types of K or M have surface temperatures of 3,000–4,000 K (compared with the Sun's photosphere ...
Amazed skiers thought they discovered a portal to another dimension when they saw a flame-shaped atmospheric phenomenon known as a "subsun" or "sun candle" this week at SkiWelt Wilder Kaiser in ...
It was believed that the cutoff for round objects is somewhere between 100 km and 200 km in radius if they have a large amount of ice in their makeup; [1] however, later studies revealed that icy satellites as large as Iapetus (1,470 kilometers in diameter) are not in hydrostatic equilibrium at this time, [2] and a 2019 assessment suggests that ...
NASA is on high alert for a “city-killer” asteroid that’s headed toward Earth — cuz they don’t wanna miss a thing. The asteroid, called 2024 YR4, now has a 1.5% probability of hitting ...