The correct unit to describe the distance between stars is the "light year", the distance a photon of light would travel (through a vacuum) in a year.
Light year or astronomical units
you use light years, and other units
The distance between two stars is typically much greater than the distance between two planets. Stars are usually light-years apart, while planets in the same star system are typically within a few astronomical units of each other.
light years
A distance in space, between stars etc.
The units currently used for distance between stars are either light-years, or parsecs. If the stars are very close together (as in a binary system), AU might also be used.
The distance between the points of (4, 3) and (0, 3) is 4 units
The distance between stars can be anything from light minutes to billions of light years.
Stars are not measured in light years. The distance between them is.
Just subtract the lowest number from the greatest number. For example, the distance between 3 and 8, is 8 - 3 = 5 units, the distance between -2 and 3, is 3 - (-2) = 3 + 2 = 5 units, the distance between -4 and -2, is -2 - (-4) = -2 + 4 = 2 units.
They do not use units: they use the fact that stars are not galaxies. For example, you don't use units to measure the difference between children and countries.
The distance between stars is a couple of order of magnitudes higher than the distance between planets.To put this into perspective, the distance between earth and the sun is 8 light-minutes and the distance between other planets doesn't go further than a few light-hours. On the other hand, the distance between our sun and the nearest star (alpha centauri) is 4.4 light-years. This means that this distance is about 38544 larger than the distance between planets.Beyond that, the distance between stars can be extremely high: a star on the other side of our galaxy will be about 100000 light-years away from us. The distance will keep rising as we move on to different galaxies, then different galaxy clusters, the super clusters and then, finally, the width of the universe.