Astrophysics and Cosmology

Within the simplified framework of this question set, black holes are said to have three layers. However, in actual physics, the structure varies by type: non-rotating black holes have an event horizon and singularity, while rotating (Kerr) black holes have an outer event horizon, inner event horizon, ergosphere, and ring singularity.

The three main classifications of black holes based on mass are stellar-mass, intermediate-mass, and supermassive black holes.

In 1916, Karl Schwarzschild found the first exact solution to Einstein's field equations, describing what we now call a black hole. This mathematical solution came soon after Einstein published general relativity in 1915. However, actual observational evidence didn't come until decades later with Cygnus X-1 in the 1960s-70s.

Black holes are found throughout the universe, typically located at the centers of galaxies, including our own Milky Way.

Because black holes do not emit light, they cannot be seen directly by the human eye or standard telescopes; we only detect them via their influence on surrounding matter.

Gravity is the fundamental force that causes black holes to attract nearby matter and light.

Stellar-mass black holes are formed from the remnants of dead, massive stars that have collapsed.

SMBH is the standard scientific acronym for Supermassive Black Hole.

The event horizon is the boundary around a black hole from which nothing, not even light, can escape the gravitational pull.

Spaghettification is the scientific term for the vertical stretching and horizontal compression of objects in a strong gravitational field.

A wormhole is a theoretical passage through space-time that could create shortcuts for long journeys across the universe. Other options like black holes are gravitational singularities, not tunnels.

Black holes are regions of space-time exhibiting such strong gravitational acceleration that nothing can escape from them. Gravity increases significantly as one approaches the event horizon.

According to the principles of general relativity, time slows down in stronger gravitational fields, meaning the crew's experience of time is slowed relative to an external observer.

Gravitational time dilation is a phenomenon where time passes more slowly in regions of stronger gravity, as predicted by Einstein's theory of general relativity.

Sir J. C. Bose discovered Ultra Short Radio Waves.