Black Holes: Regions of spacetime where gravitational forces are so strong that nothing, not even light, can escape from within them. They form when massive stars collapse under their own gravity.
Neutron Stars: Extremely dense remnants of massive stars that have undergone supernova explosions.
Quasars: Extremely luminous and distant objects powered by supermassive black holes at the centers of galaxies.
Pulsars: Highly magnetized, rotating neutron stars that emit beams of electromagnetic radiation, often observed as pulses of radiation at regular intervals.
White Dwarfs: Dense remnants of stars like our Sun that have exhausted their nuclear fuel and shed their outer layers.
Gamma-Ray Bursts: Short-lived bursts of gamma-ray radiation observed in distant galaxies, often associated with the collapse of massive stars or the merger of neutron stars.
Supernova Remnants: Nebulae of expanding gas and debris left behind after a supernova explosion.
Exoplanets: Planets orbiting stars other than our Sun. Some of them are in extreme environments, such as "hot Jupiters" orbiting very close to their stars, or "rogue planets" that wander through space without orbiting a star.