Presenter: Tom Whipple
A so-called "planetary nebula" is a confusing misnomer because these clouds have nothing to do with planets. As a medium-size star nears the end, it puffs out into a red giant — about 100 to 1,000 times its original size — eventually engulfing the space around it, including any nearby worlds.
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The business depends on packing a punch right away because the first five to 10 episodes are free, after which viewers are nudged to move to the app where they pay to watch further.
In total, some 5,000 people work in Antarctica during its summer months, across 80 research stations operated by about 30 countries.
这种方法通过类型别名和转换器封装了平台差异，避免了平台侧重复编写转换逻辑。