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"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.
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Finally, really small actuators made using traditional electric motors tend to get too hot for their own good at such scales – another headache.
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这种“量跌价升”的背后,是不同价格段市场的分化:入门级市场萎缩,高端市场免疫,中端市场承压。