A system of stars held together by gravity?

Answer 1

A sun or a star is a glowing ball of gas held together by gravity. A sun holds together a solar system of planets, so that may be the answer you are looking for.

Answer 2

A Galaxy is a system of stars held together by gravity. A Globular cluster is also a group of stars held together by gravity -- so I would need more information to determine which answer would be correct in this case.

Below I have written some further information on both types of gravitationally bound star systems, which may help you differentiate:

Star Clusters are another kind of celestial object visible in the night sky, but unlike constellations, they are made up of hundreds or thousands of stars which appear to be in such close proximity that they form a dense cluster. The Pleiadesis one example. There are two kinds of star clusters: Globular -- which are gravitationally bound, very dense star clusters of many, many old stars -- and Open clusters, which usually contain fewer stars, and often they are younger.

Galaxies are massive congregations of stars, all gravitationally bound. They also contain planetary objects, dust, and gaseous stellar remains. The Milkyway is our galaxy, and it is classified as a barred spiral. Andromeda is the nearest galaxy to us.

Stars within a Galaxy all orbit a center mass, just as the planets in a solar system orbit a center star. There can be from ten million stars to a hundred trillion stars in any given galaxy, and the universe is simply littered with galaxies. Think of a galaxy as a microcosm for the universe -- for ever star in a galaxy, that can easily by thought of as a galaxy in the universe.

Answer 3

The answer is unknown