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It depends upon what kind of planet and what kind of star.
Usually, stars are FAR larger than planets.
The sun is 10 times Jupiter's diameter and 108 times Earth's.
Even a tiny star such as Red Dwarf would be at least 2.5 times the diameter of Jupiter.
However,
If a star has reached the end of its life and collapsed, it can take 3 forms:
A white dwarf
A neutron star
A black hole
Once the star can no longer produce energy at its core, it cannot stand up against gravity. It collapses like a balloon with the air let out (only much more).
A white dwarf is a super dense remnant of a stellar core, weighing as much as 1/2 the Sun's mass but with a similar diameter of Earth. It is held stable at that size by electrical repulsion between atoms. Gravity at the surface is ferocious - at least 150,000 to 200,000 times that of Earth.
If the original star was somewhat larger, the core might be more massive, and it will collapse beyond the stage of a white dwarf, to a neutron star. Maybe 12 to 15 miles across. Electrons are jammed against the protons, resulting in much higher density. Only the "weak" nuclear force prevents it from collapsing further. Gravity on the surface of a Neutron star is insanely high - 200 Billion times that of Earth.
If the original star was larger yet, even nuclear forces cannot hold it up. Gravity is so strong the object compresses to infinite density, but with mass of 1.4 times the Sun's. No surface exists, but there is an invisible boundary called an "event horizon" where space is warped so completely that even light cannot escape. Gravity at the edge of the event horizon is trillions of times that of Earth. Event horizons size depends on the mass of the black hole. For a small one, that's about 3 miles across.
What else can I help you with?
Which planet was recently downgraded and re-classified as a star?
Pluto was redesignated as a dwarf planet. All the stars we can see are much bigger than the planets and many of them are bigger than the Sun.
What planet is 1 million times bigger than the earth?
We have not yet discovered any planet that is 1 million times bigger than the earth. The sun is approximately 1 million times larger than Earth by volume, but it is a star far larger than any planet.
Is a satellite or planet bigger?
A planet is usually bigger. However there are exceptions. For example "Ganymede", the largest satellite of Jupiter, is bigger than the planet Mercury.
What is bigger than an asteroid?
lots of things are bigger than a astriod ,planets, somtimes a moon, and the biggest star in are solar system.
What effect do planets have on the stars they orbit?
The gravity of the star is usually many times larger than the planets due to the overwhelming mass of the star in comparison. The planets do have a gravitational pull of their own though, which has an effect on the star it is orbiting. It will cause the star to move slightly off centre as it pulls on the star during its orbit. The bigger the planet, the bigger the pull. By looking at distance stars, astronomers can see the effects of planets by observing a 'wobble' in the star as the unseen planets orbits it. They can then calculate the size of the planet and distance by the size and speed of the wobble.
Which on is bigger star or planet?
Star
What is the difference in a star than a planet?
a star is way bigger than a planet. you need a telescope to see some of the planets.a star twinkles.a planet glows.
If the mass of the star were doubledwhat effect would this have on the gravitional attraction between the star and planet?
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.
How does a star compare to a planet in temperature and size?
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.
What is bigger a planet or a star?
Stars are much bigger than planets. The only stars that are smaller than planets are neutron stars.
What is bigger planet system or star system?
It would all depend on the "system" in question.
Which planet was recently downgraded and re-classified as a star?
Pluto was redesignated as a dwarf planet. All the stars we can see are much bigger than the planets and many of them are bigger than the Sun.
Is the Sun the only huge Planet?
Yes, it is one ball of gas. It's not a planet. It's a star. There is another star somewhere that is 10,000 times bigger than the sun.
Is a supernova bigger than earth?
Much bigger. Earth is a relatively small planet, much smaller than even a dwarf star. A supernova is a very large star exploding.
Which is bigger Orion or northern hemisphere?
Orion is a star. It is much bigger than the entire planet Earth, much less the northern hemisphere.
What planet is bigger then Betelgeuse?
No planet could ever come close to the size of Betelgeuse.
What is the name of a planet bigger than the sun?
There are no planets bigger than the sun. Even the largest planet Jupiter is only about 1% the size of the sun.
