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.
狗狗眼神賣萌難以抗拒 操縱人類的進化「伎倆」2019年6月19日
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Crawford - whose parent company is based in the US - was approached for comment, but the firm referred the BBC to the NHS.
Alison Francis,Senior Science Journalist