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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.

Mars didn't dry up in one go

The Perseverance rover has just landed on Mars. Meanwhile, its precursor Curiosity continues to explore the base of Mount Sharp at the centre of the Gale crater. Using the ChemCam instrument to make detailed observations of the steep terrain of Mount Sharp at a distance, a team has discovered that the Martian climate alternated between dry and wetter periods, before drying up completely about 3 billion years ago.

from Space & Time News -- ScienceDaily https://ift.tt/3teUrA0

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