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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: Preparing MetOp-C

The third in the series of MetOp satellites is scheduled for launch on 7 November from Europe's spaceport in Kourou. In this special edition of Earth from Space, ESA's MetOp-C project manager, Stéfane Carlier, talks about this latest polar-orbiting weather satellite and how its range of instruments provide data on a host of atmospheric variables such as temperature and humidity. These data are used largely for numerical weather prediction – the basis for weather forecasting. They also contribute to climate research.

from Space Exploration News - Space News, Space Exploration, Space Science, Earth Sciences https://ift.tt/2Q6af4C

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