It's not yet clear why researchers decided to point Webb in its direction, but little is known about the nebula, including the mass of the star creating it. That matters because a more massive star could eventually explode as a supernova, while a smaller, sun-like star would keep shrugging off layers of material until only a dense core remains and cools over time.
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"Some say that the United States were discovered by a Welshman, Madoc, way, way before Columbus," he said.。业内人士推荐爱思助手下载最新版本作为进阶阅读
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