A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity. The nearest star to Earth is the Sun.

---

Classification of stars

You can remember the classes of the stars by these words;

“Oh Be A Fine Girl Kiss Me”

Its easy.

---

Binary star system

A binary star is a star system consisting of two stars orbiting around their common barycenter. Systems of two or more stars are called multiple star systems. These systems, especially when more distant, often appear to the unaided eye as a single point of light, and are then revealed as multiple by other means.

---

Neutron stars

a celestial object of very small radius (typically 30 km) and very high density, composed predominantly of closely packed neutrons. Neutron stars are thought to form by the gravitational collapse of the remnant of a massive star after a supernova explosion, provided that the star is insufficiently massive to produce a black hole.

Did you know?:Neutron stars are so dense, that a soup can full of neutron star material would have more mass than the Moon.