Regions of spacetime where gravity is so intense that nothing can escape their gravitational pull, not even light.
Extremely dense remnants of massive stars, with a teaspoon of neutron star material weighing as much as a mountain.
Highly energetic and distant celestial objects powered by supermassive black holes at their centers.
An invisible form of matter that doesn't emit light or energy but affects the gravitational interactions in the universe.
Short bursts of gamma-ray radiation that are some of the most energetic events in the cosmos.
Extremely dense remnants of low to medium-mass stars that have exhausted their nuclear fuel.
Planets outside our solar system that come in various sizes, compositions, and orbits.
Explosive events that mark the death of massive stars and can briefly outshine entire galaxies.
A gravitational anomaly that appears to be pulling galaxies, including our Milky Way, towards a specific point in space.
A mysterious radio signal detected in 1977 that hasn't been satisfactorily explained and could potentially be a sign of extraterrestrial intelligence.