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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.

Calcium-rich supernova examined with x-rays for first time

X-ray images give unprecedented view of extremely rare type of supernova. New information suggests that these supernovae start as compact stars that lose mass at the end of life. Calcium-rich supernovae are responsible for up to half the calcium in the entire universe. SN 2019ehk has the richest calcium emission of all known transients.

from Astronomy News -- ScienceDaily https://ift.tt/3kf6CZS

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