Why do some believe that Jupiter is a failed star?

Jupiter is the largest planet in the solar system and has a composition similar to that of a star because it is mostly composed of hydrogen with small amounts of helium and heavier elements.

Jupiter has been considered a failed star due to its size and composition; the 2010 movie depicted Jupiter's transformation into a star.

Jupiter is actually far too small to be a star because its core does not have the temperatures and pressures necessary to initiate a fusion reaction of any kind.

The real failed stars are classified as brown dwarfs, with masses ranging from 13 to 80 times that of Jupiter, and the ability to initiate deuterium fusion.

The temperature and pressure in a star's core are sufficient to initiate hydrogen fusion, and a true star must have a mass greater than 80 times that of Jupiter.

Some believe that Jupiter is a failed star because it shares some similarities with stars in terms of its composition, primarily consisting of hydrogen and helium. Additionally, Jupiter emits more heat than it receives from the Sun, similar to a star, but it lacks the mass necessary to sustain nuclear fusion reactions and become a true star.