据新华社报道，中国国家铁路集团有限公司公布，今年春节假期（腊月二十八至正月初七）全国铁路累计发送旅客 1.21 亿人次，同比增长 11.5%；同期国家铁路累计发送货物 8538 万吨，同比增长 0.5%。
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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* @param n 堆的大小