常見例句Sitchen says this planetoid named Nibiru. 西特切說這顆小行星的名字為尼比奴。The Mars sized planetoid is approaching proto-Earth. 火星般大小的行星正在接近原始地球。This image shows the Mars-sized planetoid approaching proto-Earth. 該圖顯示的是一火星般大小的行星正在接近原始地球。There is a maximum size that mountains can attain that gets smaller as the planetoid gets more massive. (山體能達到的高度是有限度的,而且小行星引力越大,山體能達到的高度就越低。)Astronomers examining Hubble Space Telescope images of distant Sedna say the planetoid is even more mysterious than they first thought. 仔細查看了哈勃太空望遠鏡發(fā)回的遠行星Sedna的照片后,天文學家們說,這顆小行星比他們最初想象的更神秘。Some 4.4 billion years ago, for example, a Mars-size planetoid seems to have struck our young planet, throwing out enough debris to create our moon. 舉例來說,44億年前,可能有一枚火星大小的小行星撞擊誕生不久的地球,拋出的碎片形成了現(xiàn)在的月球。 返回 planetoidal