An astronaut in space on the background of a blue planetAn astronaut in space on the background of a blue planet
Moon on the background of a planet on a dark backgroundMoon on the background of a planet on a dark background
Photo of a spacecraft from space against the background of the northern lightsPhoto of a spacecraft from space against the background of the Northern lights
Pyramid in the ocean on the background of the rising moonPyramid in the ocean on the background of the rising moon
Основной цвет, тон, на к-ром пишется картина. Задний план картины. Общие условия, обстановка, где что-н. происходит ( книжн. ). Единица степени громкости.