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Massive Stars and their approximate Size

Astronomers have found massive stars in the early universe, primarily located in distant galaxies that formed shortly after the Big Bang. These regions are often studied through advanced telescopes capable of observing very distant light, such as the Hubble Space Telescope and the upcoming James Webb Space Telescope. In terms of size, these monster stars can have diameters ranging from about 100 to over 300 times that of our Sun. The Sun’s diameter is approximately 1.4 million kilometers (about 864,000 miles), so these massive stars could be approximately 140 million to over 420 million kilometers (about 87 million to 261 million miles) in diameter.
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New simulation shows how galaxies feed their supermassive black holes

While other simulations have modeled black hole growth, new model is the first single computer simulation powerful enough to comprehensively account for the numerous forces and factors that play into the evolution of supermassive black holes. Simulation shows that galaxies' spiral arms 'put the brakes on gas,' enabling it to fall into the black hole and as gas heats up while falling into a black hole, it turns into a bright quasar.

from Space & Time News -- ScienceDaily visit
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