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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.

Video: Proba-2 watches Mercury transit

ESA's Proba-2 had a ring-side seat for the transit of Mercury on 11 November 2019. Proba-2 monitors the sun from Earth orbit and was able to spot Mercury's transit as a small black disc—seen here moving from left to right across the face of the sun.

from Space Exploration News - Space News, Space Exploration, Space Science, Earth Sciences https://ift.tt/2QckZ4i

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