The celestial sphere is the imaginary globe around us. Ancient people believed the stars were fastened to it. credit: Holley Y. Bakich ...

The project, funded in part by NASA, brings scientifically accurate visualizations of objects in the celestial sphere, including planets, satellites and other NASA missions.

Answer 17: A meteoroid is a small rocky or metallic body in space. A meteor is the streak of light produced when a meteoroid enters Earth’s atmosphere. A meteorite is a meteoroid that survives passage ...

By imagining Earth at the center of a celestial sphere, he used a coordinate system similar to latitude and longitude, which had recently been devised, to measure the precise positions of the stars.

Anyone interested in astronomy realizes that the stars are scattered through three-dimensional space and not, as the ancients thought, points of light affixed to a celestial sphere.