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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.

Astronomers find cosmic golden needle buried for two decades

Astronomers made innovative use of their time while sheltering at home due to the pandemic by combing through W. M. Keck Observatory and NASA archive data. They rediscovered the first Einstein ring and found the distance of its source was never measured. The researchers are the first to make the calculation and found the quasar to be 10 billion light-years away, or a redshift of z=1.849.

from Space & Time News -- ScienceDaily https://ift.tt/2XXIald

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