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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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NASA's Interstellar Mapping and Acceleration Probe mission enters design phase

A mission to study the interaction of the solar wind with the ancient cast-off winds of other stars, and the fundamental process of particle acceleration in space, has completed a critical NASA review and is now moving closer toward a scheduled launch in 2024. Southwest Research Institute is playing a major role in the Interstellar Mapping and Acceleration Probe (IMAP) spacecraft, managing the payload office and providing a scientific instrument and other technology for the mission.

from Space Exploration News - Space News, Space Exploration, Space Science, Earth Sciences https://ift.tt/2Gy2X6y
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