Space doesn't have a known end; it likely goes on forever, but we can only see the observable universe, a boundary determined by how far light has traveled to reach us since the Big Bang (about 46.5 billion light-years radius). Beyond this "horizon," space continues to expand, so it's theoretically endless, possibly curving back on itself or just stretching out infinitely with more galaxies.
Perhaps it's the edge of the universe. Some people think that the universe is infinite – meaning it goes on forever, in every direction. In this case, there is nothing after space, because space is everything. But even if the universe did have an end, it might be very difficult for us to figure out where the edge is.
Eventually, all that remains will be black holes, neutron stars and some black dwarfs (the fate of stars like our Sun). Matter is generally stable, but over very long periods it is believed even fundamental atomic particles – the most basic building blocks of matter – may break down, leaving only black holes.
Things that are hotter, the atoms and molecules move around quicker. Now in space, it's pretty empty. There's a few molecules, maybe one atom per cubic meter or whatever it is. So, there's nothing there really to absorb that energy, that radiant energy from the Sun. So that's why space itself is pretty cold.
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.
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.
In 1 sextillion (10^21) years, the universe will be incredibly cold, dark, and mostly empty; stars will have long died, leaving only black holes, neutron stars, and white dwarfs, with galaxies merging into giant ellipses, and even supermassive black holes will be slowly evaporating via Hawking radiation, heading towards the "heat death" era where the last light sources fade, a timescale dwarfing the current age of the universe.
But eventually, the lack of oxygen will take its toll. One by one, your major organs will shut down. After only a handful of minutes you will suffer complete organ failure, otherwise known in the medical community as death.
Earth will last for billions of years, but life as we know it will likely end in about 1 billion years as the Sun gets hotter and boils the oceans, making the planet too hot and oxygen-poor; the planet itself will remain until the Sun expands into a red giant in roughly 5 billion years, eventually engulfing it. While minor geological events or asteroid impacts pose shorter-term risks, the Sun's increasing luminosity is the ultimate deadline for Earth's habitability and physical existence.
Unfortunately, the answer is "not very long at all." Within just 10 to 15 seconds, a person in space without a spacesuit would fall unconscious due to a lack of oxygen. Even if they held their breath, their lungs would expand and rupture before their blood and other bodily fluids began to boil, causing massive damage.
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.
Return to the Moon
Artemis II, scheduled for launch between February and April sees the return of the first people to the Moon since Apollo 17 in 1972. Three American and one Canadian astronaut will orbit the Moon on a 10 day journey that lays the foundation for lunar landings in the coming years.
In Big Bang cosmology, the Planck epoch or Planck era is the earliest stage of the Big Bang, before the time passed was equal to the Planck time, tP, or approximately 10−43 seconds.
There is no single, physical place that God resides in our Universe. Where is God? The Bible tells us that God is spirit and resides in His spiritual home, Heaven. It's not a physical place that can be experienced by our human senses.
There is consensus that supermassive black holes exist in the centres of most galaxies. The presence of a black hole can be inferred through its interaction with other matter and with electromagnetic radiation such as visible light.
If you mean 'absolutely' in the sense of 'completely', then no. The celebrated uncertainty principle of quantum mechanics shows that the more precisely we try to pin down the exact location of anything to tell if it's stationary, the more it jitters about.
Humans Could Live For 1,000 Years by 2050—Ushering in the Dawn of 'Practical Immortality,' Futurists Say. Some experts warn that this radical change may remain out of reach for many, due to societal and economic challenges. Technology futurists foresee advances that will enable humans to live up to 1,000 years.
2030 is considered a critical deadline, a "point of no return," for climate action because scientists warn that surpassing 1.5°C (2.7°F) of global warming around that time risks triggering irreversible "tipping points," like melting permafrost releasing methane or Amazon rainforest dieback, leading to self-reinforcing warming loops that humanity can't stop, making catastrophic climate change much harder or impossible to avoid, even with future emissions cuts, according to reports from the UN IPCC, Science News and other experts.
The Doomsday Clock is a symbol that represents the estimated likelihood of a human-made global catastrophe, in the opinion of the nonprofit organization Bulletin of the Atomic Scientists. Doomsday Clock. The Doomsday Clock pictured at its setting of "89 seconds to midnight", last changed in January 2025.
Fresh milk is yet another commodity prohibited in space due to its perishable nature. Milk would spoil within a few hours in the zero-gravity environment, which would be harmful for health if not refrigerated. Astronauts use powdered or ultra-pasteurized milk instead, which has a much longer shelf life.
A black hole is a region of space so dense, nothing can escape its its gravitational pull: not even light or any other form of electromagnetic radiation. Cross its 'event horizon' and you'll disappear forever. And astronomers now think there's a supermassive black hole at the centre of most galaxies.
Spaceflight is a risky business without a doubt, but deaths in space are remarkably rare. In fact, technically speaking only three people have ever died 'in space' – although the total number of deaths related to spaceflight and space missions is over the 300 mark.
Based on known risks, the really cataclysmic ones, those that might exterminate us as a species, are fairly rare. Based on what we know today, it would be very unlikely that we wouldn't be around in the year 3000. There certainly would be bad times, but some of us would get through it.
The Bible does not directly address the age of the Earth or the universe. The number of 6000 years came from Archbishop Ussher in the 17th century.
Contents