A telescope sight is a device used to observe distant objects in the sky. It can be used to observe comets, stars, novas, and nebulas. A COMET is a small, icy body that orbits the sun and has a visible coma and tail. A STAR is a luminous celestial body made up of plasma held together by its own gravity. A NOVA is a STAR that suddenly increases in brightness due to an increase in the rate of nuclear fusion. A NEBULA is a cloud of gas and dust in space. All of these objects can be seen through a telescope sight.