Universe - All matter and mass (Everything), Galaxies - A system of billions of stars held together by gravity, Nebula - a cloud of gas and dust where stars are formed, Star - dense sphere of gas and dust held together by gravity (VERY HOT), Planets - round-shaped objects that orbit stars,

Components of the Universe

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?