If you were close to a black hole, you'd see the universe warped and distorted by extreme gravity, appearing as a bright, lensing ring of blueshifted stars and galaxies swirling around a central, dark abyss (the event horizon). You'd witness bizarre effects like light bending so you could see the back of your own head, your time slowing dramatically (time dilation), and eventually, your body being stretched into spaghetti (spaghettification) as tidal forces overwhelm you.
If you approached a black hole you would feel the incredibly strong gravitational pull: your feet going in would be pulled more than your head, and you would be stretched. Scientists call this effect spaghettification.
One minute near a black hole can equal years, decades, or even millennia on Earth due to extreme gravitational time dilation, where time slows drastically as gravity intensifies; the exact duration depends on the black hole's mass and your proximity to its event horizon, with the effect becoming almost infinite at the horizon itself, making an observer seem frozen to someone far away, though time still passes normally for the person falling in.
We are extremely confident black holes exist due to overwhelming evidence like stars orbiting invisible, super-massive objects (Sagittarius A*), gravitational waves from merging black holes detected by LIGO, and direct imaging of their shadows by the Event Horizon Telescope (EHT). While "100% sure" is rare in science, the consistency between Einstein's relativity, observed phenomena, and these new direct proofs leaves virtually no doubt within the scientific community.
Black holes themselves are fundamentally unseeable. There's no way to bring back light from beyond the event horizon—the point at which light itself is irrecoverably lost to the object's gravity.
Your body stretches out, not uncomfortably at first, but over time, the stretching will become more severe. Astronomers call this spaghettification because the intense gravitational field pulls you into a long, thin piece of spaghetti. When you start feeling pain depends on the size of the black hole.
About 95% of the universe is "invisible" because it's composed of dark matter (around 27%) and dark energy (around 68%), which don't emit, absorb, or reflect light, unlike the normal matter (stars, planets, us) that makes up the visible 5%. Dark matter's presence is inferred through its gravitational pull on visible galaxies, while dark energy is a mysterious force causing the universe's accelerated expansion.
Black Holes. Find out why we can't see them! At the center of most galaxies is one of the strangest and deadliest things in the universe: a black hole.
Most large galaxies have supermassive black holes embedded in their center, including our own Milky Way. Whether they can escape their tight galactic bonds is a longstanding mystery.
In a similar vein, Einstein regarded black holes as lying outside proper physics. His antipathy to them was quite strong. In the modern literature, the singularity at the center of a black hole is the locus of great concern. Einstein's analysis did not extend that far.
1 hour on Earth can equal 7 years in space (or vice versa) due to time dilation, a concept from Einstein's relativity where strong gravity or extreme speeds slow down time relative to an outside observer, famously depicted in the movie Interstellar on a planet near a black hole where an hour for the crew meant years passing on Earth. It's not about speed alone in orbit (ISS astronauts age slightly slower), but about proximity to immense mass, like a black hole, bending spacetime so drastically that time crawls for those nearby compared to time far away.
TON 618 is scary due to its incomprehensible size (66 billion solar masses), making it an ultramassive black hole, its immense event horizon that dwarfs the entire Solar System, its extreme brightness as a quasar outshining galaxies, and the profound mystery of how such a massive object formed so early in the universe, challenging known physics. It represents an ultimate cosmic monster that seems to defy the rules of black hole growth, making it a source of awe and existential dread.
However, such quantum black holes would instantly evaporate, either totally or leaving only a very weakly interacting residue. Beside the theoretical arguments, cosmic rays hitting the Earth do not produce any damage, although they reach energies in the range of hundreds of TeV.
In 1 sextillion years (10²¹ years), the universe will be a vastly different, dark place: the era of star formation will have ended, all stars will have burned out into white dwarfs, neutron stars, or black holes, planets will be cold and lifeless, and even protons might begin to decay, leading towards the "Big Freeze" or heat death, with only black holes slowly evaporating via Hawking radiation over unimaginable timescales. All familiar structures, including galaxies, will have long dissolved as the universe expands, leaving behind a cold, dark, and nearly empty expanse.
However, in general, the process of spaghettification would be very rapid, and the person would likely die within a matter of seconds or minutes after crossing the event horizon.
The Black Hole That Kills Galaxies — Quasars. Quasars are the most powerful objects in the universe — blazing beacons powered by supermassive black holes devouring matter at the centers of galaxies.
Leaving the galaxy far enough to photograph it is a whole different undertaking for a species that has not yet left the Solar System. "To get [images of the Milky Way] a spacecraft would have to travel either up or down from the disk of the Milky Way, and travel so incredibly far," Doten explains.
3 AM is considered scary due to folklore calling it the "Witching Hour" or "Devil's Hour," a time when supernatural beings are strong and the veil between worlds thins, but it's also linked to physiological factors like being cold, deep sleep cycles (REM), and increased anxiety when awake in the quiet, dark, and still night. The quiet allows unsettling thoughts to surface, amplified by darkness and strange noises, making mundane things feel threatening.
The environment of space is lethal without appropriate protection: the greatest threat in the vacuum of space derives from the lack of oxygen and pressure, although temperature and radiation also pose risks. The effects of space exposure can result in ebullism, hypoxia, hypocapnia, and decompression sickness.
On April 13, 2029, the large asteroid Apophis (99942) will have a very close, but safe flyby of Earth, passing within 32,000 kilometers (20,000 miles) of our planet—closer than some satellites—and will be visible to the naked eye in the night sky from parts of the Eastern Hemisphere (Europe, Africa, Asia) as a bright, fast-moving point of light. This rare event offers scientists a unique opportunity to study an asteroid of its size (about 375 meters wide) up close, with missions like NASA's OSIRIS-APEX and ESA's Ramses planned to observe it.
These are the first words in the Bible: “In the beginning God created the heavens and the earth” (Genesis 1:1). Everything that exists has been created by God. This means the full expanse of the universe was created by God.
As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year (365.25 days). Despite its inclusion of the word "year", the term is not a unit of time.
Space, or outer space, is a vast, near-perfect vacuum largely devoid of matter. This vacuum contains very few particles compared with Earth's atmosphere. However, it's not entirely empty. Space is dotted with scattered matter called the interstellar medium, which includes hydrogen and helium atoms.