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.
Open-source projects that rely on volunteer contributors
。搜狗输入法2026对此有专业解读
Алевтина Запольская (редактор отдела «Бывший СССР»)
第一百三十三条 公安机关及其人民警察办理治安案件，应当自觉接受社会和公民的监督。