What are some of the terrifying things that Stephen Hawking discovered?

Fifteen mysterious radio signals are believed to have originated from a small galaxy 3 billion light-years away.

Stephen Hawking, the astrophysical genius who took Isaac Newton's place at Cambridge University, may have discovered what he feared most in the universe: evidence of extraterrestrial life.

Hawking, who had long been cautious about contact with extraterrestrials, said, "Ignore them and don't reply to their messages. They will treat us no differently than bacteria. If we encounter them, they will treat us the same way Christopher Columbus treated the indigenous peoples he encountered in the New World." Nevertheless, contact is still possible.

In fact, radio signals travel at the speed of light, and the ones collected this time were transmitted 3 billion years ago, when only single-celled organisms existed on Earth 2 billion years ago.

"If the aliens sent that signal, they are already dead. And if we sent a reply, by the time it reaches them, our civilization will have already turned to ashes," Hawking says.

Scientists are using the computers of 9 million volunteers around the world, tuning into 10 trillion different frequencies, to study the 100 closest galaxies to us.

Where is the signal coming from?

In this case, the signal was first detected in 2012 by the Green Bank Telescope in West Virginia. In 2015 and 2016, the source of the signal was still active, and the possibility that it was "pulsations from an accidental supernova explosion" was ruled out.

The source of these signals could be the energy source that extraterrestrials are using to power their vehicles. However, these signals could also be coming from neutron stars, which are one of the strangest objects in the universe. Scientists are currently conducting detailed investigations to determine the exact origin of these signals.

What are some of the most surprising and mind-boggling cosmological discoveries?

 Imagine tossing an apple in the air, expecting it to fall, only for it to accelerate upward into the sky. In 1998, astronomers discovered the universe is doing exactly that.

1. Accelerating Expansion (Dark Energy)
For decades, cosmologists assumed gravity was slowly braking the expansion of the cosmos. Instead, observations of distant supernovae revealed that galaxies are actually accelerating apart. This unknown driver, dubbed "dark energy," makes up nearly 70% of the universe, yet its physical nature remains entirely unknown.

2. Ripples in Spacetime (Gravitational Waves)
Einstein predicted that accelerating objects would create invisible ripples in the fabric of spacetime, like a boat moving through water. He thought they would be too faint to ever detect. In 2015, the LIGO observatories detected a signal lasting a fifth of a second—the "chirp" of two black holes colliding over a billion light-years away. For a brief moment, the power radiated by this invisible collision was 50 times greater than the combined light of all stars in the observable universe. The detection was only possible because the physical distance between mirrors on Earth briefly changed by a fraction of the width of a proton.

3. The Boötes Void
The universe is structured like a cosmic web. Galaxies form long filaments, and between those filaments are dark, empty voids. The Boötes Void is a spherical region of space roughly 330 million light-years across. A sphere of space that size anywhere else in the universe typically contains around 10,000 galaxies. In the Boötes Void, astronomers have found only about 60. As astronomer Greg Aldering noted, if the Milky Way had been in the center of the Boötes Void, humans would not have known other galaxies existed until the 1960s.

4. The Deep Fields
In the 1990s, astronomers pointed the Hubble Space Telescope at a tiny, seemingly empty patch of black sky—an area roughly the size of a grain of sand held at arm's length. It seemed like a poor use of telescope time. But after staring at that blank spot for days, the image came back filled with thousands of glowing jewels. They were not stars; they were entire galaxies, billions of light-years away. Recent observations by the James Webb Space Telescope repeated this feat in infrared, confirming that no matter where telescopes look in the darkness, there are trillions of stars and billions of worlds.

The James Webb Space Telescope's First Deep Field shows thousands of distant galaxies in a patch of sky approximately the size of a grain of sand held at arm's length. Source: Wikimedia Commons.

Are there any significant discoveries that were discovered by accident?

 In 1964 two physicists at a telephone company’s research lab accidentally discovered something that became one of the most significant discoveries in the history of cosmology.

Arno Penzias and Robert Wilson were given access to an old corporate antenna at Bell Labs. Their task was to gather some useful data about radio signals from the Milky Way Galaxy.

When they started using the equipment they soon noticed a background static which was continuous and increasingly annoying. They tried pointing the antenna in many different directions but the static never changed.

For over a year they tried figuring out the source of the static with no luck. They even thought it might be due to pigeon droppings on the antenna, so they cleaned it and made sure no pigeons came near it. But the signal still remained constant.

Then one day by pure luck Penzias was talking to a friend who mentioned that another physicist named Robert Dicke had a theory that if Big Bang actually happened there must exist a faint background radiation throughout the entire universe.

Hearing this, Penzias was stunned. This is exactly what he had been detecting for over an year and could not explain.

Penzias and Wilson contacted Dicke and this is what led to the discovery of Cosmic Microwave Background radiation. In 1978 both Penzias and Wilson received a Nobel Prize in physics for this discovery.

One of their colleagues jokingly said most people look for gold and find dung. These two went out looking for dung and found gold.

What are some scientific discoveries that have changed the world?

 According to Isaac Asimov, the truly important scientific discovery was when Benjamin Franklin published his paper in 1752 stating that "lightning is an electrical phenomenon."

As they say, it's no exaggeration to say that this changed everything. Previous scientific discoveries were only important to other scientists; they had no bearing on humanity as a whole. When Galileo published his geocentric theory, the church opposed it, but it didn't make much of an impression on the general public.

However, Franklin's discovery led to very practical applications.

This is one of Franklin's "lightning rods," a device designed to prevent lightning from striking buildings.

This spread like wildfire, like, "Oh, I don't know, maybe it was lightning?" Within 10 years, churches were the only ones not using lightning rods, because they believed lightning was the work of God and a specific reward from Him. However, after lightning struck a church where gunpowder was stored, (perhaps because God likes churches?) churches also began to adopt them.

The idea that science can solve real-world problems began with lightning rods, and before we knew it, the strange phenomenon of "electricity" came to be used for all sorts of purposes.

For motors that do not require flames,

Bright, inexpensive, and safe lighting,

For extremely fast computers, etc.

What are some recent discoveries in Archaeology?

 A 2010 discovery in archaeology changed our understanding of human evolution.

There is a real possibility that some of you reading this carry the DNA of a species we didn't even know existed 15 years ago.

The species in question are the Denisovans. Identified from just a finger bone found in a remote Siberian cave. Despite leaving behind very few physical remains, the study of their DNA revealed that they once roamed across much of Asia and the Pacific, interbreeding with early humans who carried their legacy forward.

In 2025, scientists finally identified the famous Dragon man skull, discovered in China in the 1930’s, as most likely a Denisovan.

A recent study using molecular analysis of a 400000 year old tooth found genetic links between Homo erectus and the Denisovans, pushing their story even further back into prehistory.

A species lost to time now stares back through some of us. Not a bad legacy for a species discovered from a single finger bone.

Skull image : Wikimedia Commons / Fu et al. (2025), CC BY 4.0

What are the latest discoveries that shocked the world?

 Scientists discover Kraken beak fossil! (Nanaimoteuthis hagarti)

Scientists recently discovered 27 ancient octopus beaks in Canada and Japan that date back 72 million to 100 million years, contemporaneous with dinosaurs.

The size of the beak is very large, about 50% larger than the beak of the Giant squid.

Because the ratio between the size of the beak and the size of the octopus's body is consistent, scientists can estimate the size of the ancient octopus and the largest estimate is 18.6 meters !

That size is slightly larger than legendary giant predators such as mosasaurs, livyatan, and can even match the size of megalodon.

Based on analysis of scratches on its beak, scientists found that the level of wear and scratches on its beak was very high , even eroding 10% of its beak size.

This means that the Kraken often ate very hard and dense prey , so it is possible that the Kraken also preyed on giant marine reptiles such as plesiosaurs and even mosasaurs.

Are there any significant discoveries that were discovered by accident?

 

Some inventions which changed world…

1. Sir Robert chesebrough (Vaseline)

Robert was a chemist who used to refine kerosene, but after decrease in petrol price his business slowdown.

One day during his visit to an oil refinery in Pennsylvania, he saw a worker removing some sticky thing from his body, when asked he told him that they used to apply it on burned or cut skin to heal the wound.

Thus, Robert got his “petroleum jelly”

When local chemist didn't show any trust in his product, He even travelled to New York to give live demornstration of this product. In front of large crowd he burned his skin and applied it over. In few years Vaseline was popular worldwide.

2. George de Mestral- (velcro)

George de Mestral was a Swiss engineer, in 1941 he went in woods with his dog for hunting. on arriving back he noticed that Burr seed was clung to his dog's fur and his clothes, he wondered and examined Burr under microscope and discovered that it was covered in tiny hooks and by that he was inspired by Hook and loop method.

He researched for 8 years and named it velcro vel(velvet) and cro(crochet).

A fastener way between buttons and zipper, it is now used in number of items including sandals,bags,toys,cords sweater to upto NASA.

Burr(which gave idea)

One of the most used product..

3. Humphrey O'Sullivan- (Rubber heeled shoes)

O'Sullivan was a young printer in Lowell, Massachusetts during 1895, he had to work on stone floor and had to stand while printing so wooden sole in his shoes and stone floor caused him pain in his feet.

so he bought a rubber mat to stand on while working, his fellow employees kept borrowing that rubber mate from him, because it was too comfortable so, he cut out two pieces of mate in heel size and nailed them to shoes.

He was pleased and astonished by the comfort of this shoes and started making full fledged rubber heels and eventually patented the idea.

In a few years his heels were being shipped all over country, one of his advertisement in newspaper……

4. Edouard Benedictus-(laminated glass)

Edouard a French chemist/scientist once was climbing a ladder and accidentally knock a glass flask of shelf. It fell to the floor and shattered but to his surprise shards of glass still remain in or almost in shape as before.

He was confused and asked his assistant what was in the flask he said cellulose nitrate (liquid plastic). After the experiments a layer of cellulose nitrate remained in the flask prevented glass from breaking.

This gave edouard idea of safety glass/laminated glass on windscreen which has saved so many lives after accidents.

Swedish company Volvo used this safety glass first time in Volvo PV 44 as windscreen in 1944.

5. Percy Spenser-(microwave oven)

He was an American radar Engineer who used to focus on working and building of magnetron because magnetron generated microwave signals which was core mechanism of radar.

One day when he was working a candy bar in his pocket melted at first he was confused and then he understood that it was miracle of the microwaves he put a Bowl of corn and made first “microwaved popcorn”.

Percy continued experimenting and made microwave by attaching a high density electromagnetic field generator to an enclosed metal box.

6.Willis Carrier-(air conditioner)

In 1902 the Willis was given a project by his company buffalo forge to solve a problem of humidity in a lithographic and printing company in Brooklyn, they told him that the problem was that because of humidity in printing room ink would not dry.

He worked several years on this project, one day in garden when he saw moisture droplets on an alluminium pipe, an idea struck his mind.

he used pipe that would carry cold water and beneath them he kept two fan one would throw moist air towards pipe and other one kept moving air circulation of room.

Thanks to Willis otherwise imagine summer in cities like Delhi, Ahmadabad and Rajasthan(state) without air conditioner!!

Present time air conditioner

The Best way to predict future is to invent it- Alan kay

What incredible archaeological discoveries came in the least expected places?

 The Secret Under Gobekli Tepe: The Shepherds Knew First.

It is just the bare fact that people were walking over history and they did not even realize it. These stones had been used over the years as normal rocks by local shepherds. This is because they did not know that they were sitting on something big.

Then archeologists appeared--and all was different.

In Gobekli Tepe, they discovered large stone pillars which were more than 10,000 years old. That is even older than the pyramids. The shocking part? Those who constructed them were mere hunters. Cities, no; machines, no; and yet they created something great.

It doesn't stop there.

Near at hand is Karahan Tepe and this is even older--about 12,000 years. It has queer carvings and sunk deep stone rooms. It appears to be a worshiping place and not a relatable living place.

And it all came about in the Younger Dryas, when the world was very cold and harsh. It was hard to live--but man was creating.

So what does this mean?

Perhaps, it is not so much that people initially constructed farms then constructed temples. Perhaps they erected temples at first--and that compelled them to make themselves permanent.

Suppose that that is the case, then we may have the entire narrative of the ancient civilization incorrect.

What is the most interesting archaeological discovery ever made?

 The archaeological discovery that changed our entire understanding of the level of technology possessed by ancient civilisations, remaining unequalled for more than 1,500 years.

Since its discovery, it has remained the most compelling Archeological artefact ever found, being studied more than any other single artefact in the entire history of Archaeology. However, only in the last few years can we finally say we understand the true purpose and scale of the genius behind it.

The remarkable events that led to this Archeological discovery in many ways echo the chilling circumstances behind its owner's harrowing final moments.

“How does the bust of some hairy man change our understanding of anything, this is total twaddle!"

A plethora of stunning statues and treasures were discovered alongside this extraordinary artefact, in many ways, stealing the limelight at first.

During the spring of 1900, a small crew of Greek Sponge divers were forced to venture further from their home waters to find new Sponge fishing grounds, while sailing south their small fishing boat encountered a violent storm that ripped at their sails and drove them towards the rocks of a small island.

As the sea churned, forming valleys of seething deep green that threatened to capsize their small vessel or smash it against unseen rocks in the chaotic frenzy of the stormy gloom, the Greek captain wrestled for control of his little boat against the forces of nature, guiding it into a bay that sheltered them from the worst of the severe storm.

The next day, the crew awoke to find the sky clear and the water that had threatened to take their lives the night before now calm and crystal clear. Having never fished the waters around this island before, the captain sent a young diver down to see if there was any Sponge fishing to be had.

Elias regretted eating pickled fish and tinned beans last night.

Not long after going down, the young diver started violently tugging at his rope in a desperate panic, so the crew quickly pulled him to the surface and removed his brass helmet, shaking like a leaf, the diver said that he had seen heaps of dead bodies beneath them.

The captain suited up and decided he would go down and see for himself, because this had to be one of the most over-the-top excuses he had ever heard. What he found stunned him, for the dead bodies were in fact a mass of exquisite bronze and marble statues littered across the seabed. The captain explored the shipwreck for a while, before taking a bronze arm and returning to the surface.

The bronze arm of a boxer, found at the wreck.

With the shipwreck discovered, but not a Sponge in sight, the rather practical crew carried on their voyage to better Sponge fishing grounds, with a bronze arm safety tucked away.

Later that year, the Captain approached the Greek authorities with his bronze arm and explained his find and before long an expedition was organised with the original Sponge diving crew tasked with the role of recovering artefacts from the wreck.

Over the next two years the Sponge Divers turned Marine Archeologists would battle rough seas and storms around the island, while bringing up a vast quantity of ancient statues, coins, pristine Hellenistic glassware, and a wealth of extraordinary finds.

The shipwreck had been an enormous vessel for the ancient world and had carried a staggering amount of exquisite valuables, all of which now lay just beneath the surface.

This massive galley had probably been caught in the storms and rough seas around the little island, just as the Sponge Divers boat had, but unlike the smaller fishing boat, the Greek treasure ship had not survived, sinking around 80 BC.

Amongst all the treasure, from gold and silver coins to priceless ancient statues and jewellery, a small lump of green corroded bronze was found and chucked to the side, where it would remain in storage for the next two years, totally overlooked, sadly degrading without the proper treatment it had urgently required upon removal from the water.

The Antikythera Mechanism, 200BC.

Until one day, a visiting MP noticed the unassuming clump of green corroded bronze neglected in the corner and took a closer look, it had dried out and split, inside he could see countless gear wheels with tiny teeth, engravings and intricate mechanisms.

Naturally, everyone suddenly stopped caring about everything else from the shipwreck and focused on this remarkable artefact.

Scientists, Linguists, Archeologists, Astronomers and Naval experts from all around the world started studying the little machine. However, being only the early 1900s, it was difficult to truly understand this ingenious device, for the next 50 years it baffled the world.

Until a series of rather clever fellows slowly pieced it together, one gear diagram at a time, British Professor Price commissioned an X-ray of the Antikythera Mechanism and worked out how many teeth were on some of the gears, which seems like a rather small step forwards, but meant they now knew the device could calculate the cycles and position of the moon.

Jump forward to the last few years and a study led by the University of Cardiff in Wales which built a state-of-the-art scanner to finally unlock the answers to perhaps the greatest mystery in the history of Archaeology.

Using their custom-built high-resolution surface scanner and X-ray machine, the findings revealed 37 intricate meshing bronze gears, precision mechanisms and thousands of fine engravings.

This Antikythera Mechanism was the first analogue computer in history. It could map the movements of the moon and sun through the zodiac, accurately predict future eclipses and calculate the position of Mars, Mercury, Venus, Jupiter and Saturn.

Technology of this level quite literally didn't belong in the ancient world, or so we originally thought.

The ancient writing of Cicero talks of two incredible mechanical devices that the genius Archimedes built in the 2nd century BC, which could calculate the positions of the moon and stars with precision, the Antikythera Mechanism is possibly one of these two devices or a later copy.

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2,200 years ago, Ancient Greeks built astronomical computers that would not be equalled until the 15th century.

‘If the insight of the ancient Greeks had matched their ingenuity, we would not merely be pottering around on the Moon, we would have reached the nearer stars.’ — Arthur C. Clarke.