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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.

Can high-power microwaves reduce the launch cost of space-bound rockets?

Researchers calculated the efficiencies of four important features of microwave-beam-powered propulsion systems for rockets. These findings are critical to minimizing or possibly reducing the cost of rocket propulsion systems.

from Space & Time News -- ScienceDaily https://ift.tt/3alEvly

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