アメリカ自然史博物館さんのインスタグラム写真 - (アメリカ自然史博物館Instagram)「Today’s Exhibit of the Day is out of this world. 🚀 Behold the Museum’s Scales of the Universe, complete with realistically rendered planets! The 87-ft (26.5-m) diameter Hayden Sphere at the exhibit’s center serves as a central reference for illustrating the relative sizes of galaxies, stars, planets, cells, and atoms. For example, if the sphere represents the Milky Way galaxy, a typical star cluster within it is the size of a baseball. If the sphere is taken to be the Sun, Earth would be the size of a grapefruit! Photo: D. Finnin/ © AMNH #space #planetarium #astronomy #didyouknow #science #sciencefacts」9月16日 22時00分