Unit 1: Earth and Space

Unit 1: Earth and Space

1. Astronomy → The scientific study of what is there beyond EARTH. Celestial Object → Any object that exists in space. Universe → everything that exists, including all energy, matter, and space. Star → A massive collection of gases, held together by its own Luminous → producing and giving off light shining Planet → A large, round celestial object that travels around a star. Satellite → A celestial object that travels around or dwarf planet. Orbit → the closed path of a celestial object or satellite as it travels around another celestial object. Galaxy → a huge, rotating collection of gas, dust, and billions of stars, planets, and other celestial objects Electromagnetic Radiation → Energy emitted from matter, consisting of electromagnetic waves that travel at the speed of light. Electromagnetic Spectrum → the range of wavelengths of electromagnetic radiation., extending from radio waves to gamma rays, and including visible light. Sunspots → dark spots appearing on the SUn's surface t