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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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Giant radio pulses from pulsars are hundreds of times more energetic than previously believed

Scientists using coordinated observations of the Crab pulsar in a number of frequencies, have discovered that the 'giant radio pulses' which it emits include an increase in x-ray emissions in addition to the radio and visible light emissions that had been previously observed. This finding, published in Science, implies that these pulses are hundreds of times more energetic than previously believed.

from Space & Time News -- ScienceDaily https://ift.tt/3d1rYIz
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