Because stars have their own light and energy, they do not need to orbit planets or other stars, hence the distances are much bigger.
Because planets lack their own light, they must orbit stars, which are typically orbited by many planets. Trigonometric parallax, also known as star parallax, is a technique used by astronomers to calculate the distances of nearby celestial objects. Simply defined, when Earth revolves around the sun, they gauge a star's apparent movement against the backdrop of farther-off stars. Light years are the units used to describe distances to stars. An astronomical unit is smaller than a light-year. For computations, astronomers employ the metric system.
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