• Jan 16, 2026 stars nebulae and the interstellar medium observa d gas, primarily hydrogen, that emit light at specific wavelengths (e.g., the Orion Nebula). Reflection Nebulae: Clouds that reflect the light of nearby stars, appearing bluish due to scattering. Dark Nebulae: Dense clouds of dust that obscure background stars, seen as dark By Berta Okuneva
