銀河者,亦稱天河、天漢,棒渦星系者也,今謂之銀河系,吾太陽系處其間。以恆星、星團、星氣所構,諸星繞行。銀河之星,多如恆河之沙,不可盡數;徑蓋十萬光年,厚蓋六千光年。觀夫銀河,見星光劃空,宛如河川,故名。
銀河核厚而邊薄,曰銀盤,漩渦之狀。其質蓋日之萬億,徑蓋十萬光年,核厚一萬五千,邊厚三、六千矣。主臂蓋有四,曰矩尺、半人馬盾牌、人馬、英仙,次臂如獵戶者亦有數。日者,居獵戶臂,去核蓋二萬七千七百光年也。
太陽系者,每秒二十五萬米繞核行之,公轉之期蓋二億二千萬年也。
夫銀河之大,繁星之多,而河盤得以成形,何物縛之?何力繫之?或有超重黑洞於核中,吸力之強能繫諸星,以防諸星流離荒野。
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