What Are Stars?
Stars are massive, luminous spheres of plasma held together by gravity. They generate energy through nuclear fusion in their cores, converting hydrogen into helium and releasing light and heat. The Sun is a typical main-sequence star.
What Are Ghosts in Space?
In astronomy, "ghosts" refer to the remnants of dead stars, such as white dwarfs, neutron stars, and black holes. These objects are often invisible or emit only faint radiation, making them appear ghostly. Stellar ghosts form after a star exhausts its fuel and undergoes collapse or a supernova explosion.
How Stars Become Ghosts
Low- and medium-mass stars swell into red giants, then shed outer layers to form planetary nebulae, leaving behind dense white dwarfs. High-mass stars explode as supernovae, producing neutron stars or black holes. These remnants continue to influence their surroundings through gravity and radiation.
For more details on stellar evolution, visit NASA Stars.
