Which planet almost became a second sun?

Answer 1

During the early Solar System Jupiter came close to becoming a second sun. While Jupiter is not a sun it still produces small amounts of radiation.

Answer 2

Jupiter almost became a second sun because it is a gas giant with enough mass to start nuclear fusion. However, it did not have enough mass to sustain the nuclear reactions necessary to become a true star.

Answer 3

Jupiter. If Jupiter had a mass 10 times its current mass it would become a star.

Answer 4

As the solar system was forming, Jupiter came closest to undergoing nuclear fusion and becoming a second sun.

Answer 5

It was Jupiter.

Answer 6

Jupiter