A star is a massive, luminous ball of plasma that is held together by gravity. The nearest star to Earth is the Sun, which is the source of most of the energy on Earth. Other stars are visible in the night sky, when they are not outshone by the Sun. Historically, the most prominent stars on the celestial sphere were grouped together into constellations, and the brightest stars gained proper names. Extensive catalogues of stars have been assembled by astronomers, which provide standardized star designations.
For most of its life, a star shines due to thermonuclear fusion in its core releasing energy that traverses the star's interior and then radiates into outer space. Almost all elements heavier than hydrogen and helium were created by fusion processes in stars. Astronomers can determine the mass, age, chemical composition and many other properties of a star by observing its spectrum, luminosity and motion through space. The total mass of a star is the principal determinant in its evolution and eventual fate.
Source: en.wikipedia.org/wiki/Stars - 25.03.2010
Here it is hardly visible and apparently two-dimensional and limited, but for me in the nature it belongs to the most impressive adventures.
When I stay allone and far away from synthetic sources of light under a shining starry sky, my own littleness and dependency and the inconceivable vastness in space and time will nearly become physically tangible.