A quasar is an extremely luminous active galactic nucleus. It is sometimes known as a quasi-stellar object, abbreviated QSO.
A black hole is a region of spacetime where gravity is so strong that nothing, including light has enough energy to escape its event horizon.
A planet is a large, rounded astronomical body that is neither a star nor its remnant but remains in the universe to generate life forms.
A quasar is an extremely luminous active galactic nucleus. It is sometimes known as a quasi-stellar object, abbreviated QSO.
Gravity is a fundamental interaction or force which causes mutual attraction between all things with mass or energy.
Dark matter is composed of particles that do not absorb, reflect, or emit light, so they cannot be detected by observing electromagnetic radiation.