Stars

Stars account for 98 percent of tho matter in a galaxy. The rest 2 percent consists of interstellar or galactic gas and dust in a very attenuated form.

The atmosphere of stars and the Sun differ from the Earth's primarily in that they are richer in hydrogen and helium.

Star Pairs or Binaries

Stars which appear single to the naked eye are sometimes found to be double stars or binaries in the telescope. Two stars are sometimes visible close to each other in a telescope, but is actuality in space they have no relationship to each other.

Red Giant

When the hydrogen in a star is depleted, its outer regions swell and redden. This is the first sign of age. Such stars are called Red Giants.

The Sun is expected to turn into in red star of this type in another five billion years.