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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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Engineers' 'nanocardboard' flyers could serve as Martian atmospheric probes

Engineers are suggesting a new way to explore the sky: tiny aircraft that weigh about as much as a fruit fly and have no moving parts. These flyers are plates of 'nanocardboard,' which levitate when bright light is shone on them. As one side heats up, the temperature differential gets air circulating through its hollow structure and shooting out of the corrugated channels that give it its name, thrusting it off the ground.

from Space & Time News -- ScienceDaily https://ift.tt/2znNcPs
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