黑洞

In sentences Pinyin

黑洞hēi dòng存在cún zài吗ma？Do black holes exist? #8496270

大多数dà duō shù大dà星系xīng xì的de中心zhōng xīn都dōu有yǒu一个yī ge超chāo大dà质量zhì liàng黑洞hēi dòng。Most large galaxies have a central supermassive black hole. #10059562