Do all planets have stars?

Answer 1

MAny planets have moons. Stars are in our solar system but not associated with planets.

Answer 2

Not all planets have stars. Most planets do orbit around a star, however due to freak phenomenon, some planets migrate towards the star, pushing other planets out of the way in the process. These planets can in theory wander throughout the universe if their orbit is disrupted enough. There are some crazies out there that have even proposed Jupiter may one day swing into our neck of the woods and send Earth on one of these trajectories.

Answer 3

Stars don't need to have planets. Planets form in the gravitation fields of stars. They don't clump by themselves in open space to anything bigger than asteroids. A star holds all the dust circulating around it so that the planets can form. If there is enough dust there will be planets eventually. So I guess the answer is yes, but usually only one or rarely two stars in a binary star.

Answer 4

If you mean "do all planets orbit a star" the answer is...NO.

A number of planets that are not large enough to be brown dwarf stars but are between 5 and 15 times the mass of Jupiter were detected in 2006 in Orion's Sigma Orionis cluster near the Horsehead Nebula.

Answer 5

This definition of planet states that a planet is a body that orbits the Sun, is large enough for its own gravity to make it round, and has "cleared its neighbourhood" of smaller objects

The definition of "planet" has been the subject of intense debate in recent years. Although the word itself dates back millennia, there was no official scientific definition of a "planet" until the early 21st century.

Traditionally, the term was only applied to objects in the Solar System, and any differences there could be dealt with on an individual basis. After 1992, however, astronomers began to discover many additional objects beyond the orbit of Neptune, as well as hundreds of objects orbiting other stars. These discoveries not only increased the number of potential planets, but also expanded their variety and peculiarity. Some are nearly large enough to be stars, while others are smaller than our Moon, and they have challenged long perceived notions of what a planet could be.

The issue of a clear definition for "planet" came to a head in 2005 with the discovery of the trans-Neptunian object Eris, a body larger than the smallest accepted planet, Pluto. In response, the International Astronomical Union (IAU), recognised by astronomers as the international body responsible for resolving issues of astronomical nomenclature, released its decision on the matter. This definition, which applies only to the Solar System, states that a planet is a body that orbits the Sun, is large enough for its own gravity to make it round, and has "cleared its neighbourhood" of smaller objects.

Answer 6

By definition, all planets revolve around stars, if thats what you mean.

Or perhaps you are asking if all stars have planets. In that case we don't have good enough scientific instruments to tell. However I have long suspected that at least 99% of all stars had at least 1 planet at one time or another.

Answer 7

The definition of a planet is an object larger than a comet or asteroid that orbits a star. So, no star, no planet

Answer 8

Surely there are bodies similar to our known planets that are moving alone in the space, without a companion star. But we cannot observe them.
The only planets (according to your meaning) that we know are the ones of our solar system and what we call exoplanets, detected around stars relatively close to us.

Answer 9

Yes, because a planet is an object that orbits a star. So, no star, no planet.

Answer 10

All planets (that we know of) form around stars. We think that every star starts out with a family of planets (just like our own solar system) but that only systems where there is just one star (like ours) are stable - systems that contain two or more stars are (mostly) unstable so their planets would get flung out of the system eventually. So it is possible to find a planet wandering the galaxy, not orbiting a star, but we haven't found one yet!

Just so we are clear, there is only one star in our solar system - our Sun.

Answer 11

Yes, if you mean it the way you asked. If you meant, do all stars have planets, then the answer is no.