Jupiter.
However, it would need to be MUCH bigger. It would need about 80 times its present mass to become even the smallest possible red dwarf star.
Even if you count "brown dwarfs", Jupiter would still need more than ten times its present mass just to be the smallest brown dwarf.
It would make the gravity of the star have more power.As for your question, it all depends.If the planet was bigger than the star, the star would be pulled in gravatationally(if that's even a word).If the star were bigger than the planet, the planet would be pulled in.
Star
It would all depend on the "system" in question.
a star is way bigger than a planet. you need a telescope to see some of the planets.a star twinkles.a planet glows.
Jupiter. However it would have to be about 10 times bigger, at least.
A shining star is much bigger than a planet. A star produces light and heat and other types of radiation of it's own. A planet does not.
Since we can't explore the galaxy, the sizes could be almost limitless. but I would doubt the planet could get bigger than the star it orbits which would be realistically impossible.
If a dwarf star crashed into a planet,the planet would likely explode.
in most cases, a star is bigger than a planet. yet, both stars and planets have different sizes, such as a white dwarf star is smaller than Jupiter.
most people would think it is a star but it is a planet
There are no planets in our solar system that "could have been a star" if they had been "a little bigger".You may be referring to Jupiter; however, it would have had to be about 20 times bigger. That's like saying that a tricycle could have been a school bus if it were "a little bigger".
Stars are much bigger than planets. The only stars that are smaller than planets are neutron stars.