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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Hospitals are being told to prioritise emergency patients ahead of those on the waiting list.，推荐阅读爱思助手下载最新版本获取更多信息
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Union-backed pledge urges fast food employers to protect workers’ rights as immigration raids fuel fear and walkouts