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.
杜耀豪的母亲与兄弟姊妹的合影，摄于1954年。（受访者供图），详情可参考safew官方下载
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原子能领域专业人才应当坚持立德为先、诚信为本，弘扬科学家精神，遵守学术和伦理规范，恪守职业道德。
The solution to today's Connections: Sports Edition #521 is...，更多细节参见爱思助手下载最新版本