"The nebula appears to have distinct regions that capture different phases of its evolution — an outer shell of gas that was blown off first and consists mostly of hydrogen, and an inner cloud with more structure that contains a mix of different gases," NASA's blog post reads. The dark line that runs vertically through the nebula, giving it the cranial appearance, could be the result of "an outburst or outflow from the central star, which typically occurs as twin jets burst out in opposite directions." Both Webb's Near-Infrared Camera (NIRCam) and its Mid-Infrared Instrument (MIRI) were used to document the nebula.
对于在线旅游行业而言，单纯连接供需的“撮合”价值已然见顶，行业的下一程，核心矛盾在于如何将海量的用户需求，转化为对供给侧——尤其是遍布全国的中小酒店、旅行社、县域景区——实实在在的提质增效。
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医药股投资，拼的是研发实力和管线厚度，而不是靠一个噱头十足的新药概念，赌一场遥不可及的未来。