10 science photos that made history and changed minds

These photos of scientific heroes and accomplishments inspire awe and curiosity.

  • Science has given humanity an incalculable boost over the recent centuries, changing our lives in ways both awe-inspiring and humbling.
  • Fortunately, photography, a scientific feat in and of itself, has recorded some of the most important events, people and discoveries in science, allowing us unprecedented insight and expanding our view of the world.
  • Here are some of the most important scientific photos of history:

1. Hubble's "eXtreme Deep Field"

This photo, released on September 25th, 2012, called the eXtreme Deep Field, or XDF, was put together as a combination of 10 years of NASA Hubble Space Telescope's pictures. All this image does is show us the beginning of the universe. The galaxies revealed by the image date back to about 13.2 billions years ago while the universe is estimated to be 13.7 billion year old.

The Hubble achieved this feat by gathering faint light over an exposure lasting 23 days. This deepest image of the universe ever taken at that time showed us thousands of galaxies, both near and far. More specifically, the patch of space shown by the photo is in the constellation Fornax.

2. Solvay Conference of 1927

One of the most famous gatherings of scientists that still continues to this day, the Solvay Conferences are pre-occupied with tackling the major problems of physics and chemistry. The meeting is produced by the International Solvay Institutes for Physics and Chemistry, founded by the Belgian industrialist Ernest Solvay in 1912.

Perhaps the most famous such conference was the one that took place in October 1927, when the topic was electrons and photons. That meeting, documented in this photo, was attended by seminal figures in physics and chemistry, including Albert Einstein, Marie Curie, Niels Bohr, Werner Heisenberg, Erwin Schrödinger, Max Planck, and many more. 17 of the 29 people attending were or became Nobel prize winners following it. The major battle of that conference involved the debate between scientific realists, led by Einstein, and instrumentalists, led by Bohr.

3. Trinity Nuclear Test

Credit: Berlyn Brixner / Los Alamos National Laboratory

The first-ever detonation of a nuclear weapon, code-named "Trinity," took place at 5:29 a.m. on July 16th, 1945. Giving birth to the atomic age, this was a culmination of efforts by the scientists of the Manhattan Project. The test took place at about 35 miles (56 km) southeast of Socorro, New Mexico at what at that point was the USAAF Alamogordo Bombing and Gunnery Range.

The 22-kiloton explosion involved a plutonium device, nicknamed "The Gadget." It had the same design as the "Fat Man" – the bomb eventually detonated over Nagasaki on August 9th, 1945.

Interestingly, the name "Trinity"" came from J. Robert Oppenheimer, the director of the Los Alamos Laboratory. He was inspired by the poetry of John Donne.

4. Pale Blue Dot

Credit: NASA

This celebrated image was taken by the Voyager 1 space probe at the suggestion of the astronomer Carl Sagan on February 14th, 1990. The probe at that point was 6 billion kilometers (3.7 billion miles) away from Earth. Because of that, Earth looks just like a dot or a pixel in the photo, highlighting the astounding vastness of space.

The photograph inspired this beautiful passage by Carl Sagan in his book "Pale Blue Dot":

"Look again at that dot. That's here. That's home. That's us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives. The aggregate of our joy and suffering, thousands of confident religions, ideologies, and economic doctrines, every hunter and forager, every hero and coward, every creator and destroyer of civilization, every king and peasant, every young couple in love, every mother and father, hopeful child, inventor and explorer, every teacher of morals, every corrupt politician, every "superstar," every "supreme leader," every saint and sinner in the history of our species lived there--on a mote of dust suspended in a sunbeam."

5. Nikola Tesla in His Lab

This remarkable image of the inventor Nikola Tesla was taken in his laboratory in Colorado Springs around 1899. Here he is supposedly sitting and reading right next to his gigantic "magnifying transmitter" while this high voltage generator creates stunning bolts of electricity. This photo did much to further the Tesla myth, but it was actually a promotional stunt engineered by the photographer Dickenson V. Alley. He used a double exposure, combining images of the machine producing sparks in a dark room with an image of Tesla sitting in his chair.

Writing in his Colorado Springs Notes, Tesla later confessed that the photo was an early photoshop job: "Of course, the discharge was not playing when the experimenter was photographed, as might be imagined!"

6. Dirac and Feynman Talking

In this humanizing photo, taken in Warsaw in 1963, the physicist Richard Feynman is talking with his hero – the physicist and Nobel Prize winner Paul Dirac, who is considered one of the founding fathers of quantum mechanics.

According to Anton Z. Capri's "Anecdotal History of Physics," there is a story about Dirac that gives us a nice insight into his precision-seeking character:

Pauli and Dirac were once riding a a train together. To try to break the silence, Pauli pointed out the window and commented on some sheep he saw: "It looks like the sheep have been freshly shorn." To which, having also examined the sheep outside, Dirac replied: "At least on this side."

7. Photograph 51

Photo 51 was the first-ever image taken of DNA, in a critical step towards identifying its structure. The photo showing a double helix was produced by the PhD student Raymond Gosling in May of 1952, working under the supervision of Rosalind Franklin at King's College London. The photo ended up being instrumental in the work of Francis Crick, Maurice Wilkins and James Watson in developing the chemical model of the DNA molecule, which led to their 1962 Nobel Prizes. Unfortunately, the prize was not given to Franklin.

8. Buzz Aldrin on the moon

Credit: NASA

This photo, taken on July 20th, 1969, is of the Apollo 11 astronaut Buzz Aldrin walking on the surface of the moon. It's hard to get more iconic than that.

Aldrin was actually near the leg of the lunar model Eagle when the picture was taken by the Apollo 11 commander Neil Armstrong. The gear used was a 70mm lunar surface camera. That day Armstrong and Aldrin went exploring the Sea of Tranquility for about two and a half hours. Michael Collins, their crewmate, orbited above in the command module Columbia.

9. Nils Bohr and Albert Einstein Debate Quantum Mechanics

In the 1920s, the physics world erupted in debates over the interpretation of the fledgling field of quantum mechanics between some of history's most accomplished physicists. One one side you had Nils Bohr and Werner Heisenberg who claimed in their theory that physical systems have only probabilities and not specific properties until someone measured them. On the other side, as explains Nature magazine, you had Albert Einstein arguing that entities had independent realities, encapsulated in Einstein's famous quip God "does not play dice". He proposed that the Copenhagen interpretation was incomplete and that there existed yet-undiscovered hidden variables. This battle for the soul of quantum mechanics, captured in this 1925 photo, is still with us today.

10. Earthrise

Credit: NASA

This is another NASA photograph, this one taken on December 24th, 1968, by the Apollo 8 astronaut William Anders during a first manned voyage to orbit the moon. This Christmas-Eve image has come to be considered "the most influential environmental photograph ever taken," as it was declared by the noted nature photographer Galen Rowell. The color photo of the vibrant, lively Earth over the barren landscape of the moon changed many people's views and religious stances. It was also featured on a U.S. Postal Service stamp.

Here's a telling transcript from an audio recording of how the photo was taken – a quick exchange between Anders and mission commander Frank Borman:

Anders: Oh my God! Look at that picture over there! There's the Earth coming up. Wow, that's pretty.

Borman: Hey, don't take that, it's not scheduled. (joking)

Anders: (laughs) You got a color film, Jim? Hand me that roll of color quick, would you...

Lovell: Oh man, that's great!

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New fossils suggest human ancestors evolved in Europe, not Africa

Experts argue the jaws of an ancient European ape reveal a key human ancestor.

Surprising Science
  • The jaw bones of an 8-million-year-old ape were discovered at Nikiti, Greece, in the '90s.
  • Researchers speculate it could be a previously unknown species and one of humanity's earliest evolutionary ancestors.
  • These fossils may change how we view the evolution of our species.

Homo sapiens have been on earth for 200,000 years — give or take a few ten-thousand-year stretches. Much of that time is shrouded in the fog of prehistory. What we do know has been pieced together by deciphering the fossil record through the principles of evolutionary theory. Yet new discoveries contain the potential to refashion that knowledge and lead scientists to new, previously unconsidered conclusions.

A set of 8-million-year-old teeth may have done just that. Researchers recently inspected the upper and lower jaw of an ancient European ape. Their conclusions suggest that humanity's forebearers may have arisen in Europe before migrating to Africa, potentially upending a scientific consensus that has stood since Darwin's day.

Rethinking humanity's origin story

The frontispiece of Thomas Huxley's Evidence as to Man's Place in Nature (1863) sketched by natural history artist Benjamin Waterhouse Hawkins. (Photo: Wikimedia Commons)

As reported in New Scientist, the 8- to 9-million-year-old hominin jaw bones were found at Nikiti, northern Greece, in the '90s. Scientists originally pegged the chompers as belonging to a member of Ouranopithecus, an genus of extinct Eurasian ape.

David Begun, an anthropologist at the University of Toronto, and his team recently reexamined the jaw bones. They argue that the original identification was incorrect. Based on the fossil's hominin-like canines and premolar roots, they identify that the ape belongs to a previously unknown proto-hominin.

The researchers hypothesize that these proto-hominins were the evolutionary ancestors of another European great ape Graecopithecus, which the same team tentatively identified as an early hominin in 2017. Graecopithecus lived in south-east Europe 7.2 million years ago. If the premise is correct, these hominins would have migrated to Africa 7 million years ago, after undergoing much of their evolutionary development in Europe.

Begun points out that south-east Europe was once occupied by the ancestors of animals like the giraffe and rhino, too. "It's widely agreed that this was the found fauna of most of what we see in Africa today," he told New Scientists. "If the antelopes and giraffes could get into Africa 7 million years ago, why not the apes?"

He recently outlined this idea at a conference of the American Association of Physical Anthropologists.

It's worth noting that Begun has made similar hypotheses before. Writing for the Journal of Human Evolution in 2002, Begun and Elmar Heizmann of the Natural history Museum of Stuttgart discussed a great ape fossil found in Germany that they argued could be the ancestor (broadly speaking) of all living great apes and humans.

"Found in Germany 20 years ago, this specimen is about 16.5 million years old, some 1.5 million years older than similar species from East Africa," Begun said in a statement then. "It suggests that the great ape and human lineage first appeared in Eurasia and not Africa."

Migrating out of Africa

In the Descent of Man, Charles Darwin proposed that hominins descended out of Africa. Considering the relatively few fossils available at the time, it is a testament to Darwin's astuteness that his hypothesis remains the leading theory.

Since Darwin's time, we have unearthed many more fossils and discovered new evidence in genetics. As such, our African-origin story has undergone many updates and revisions since 1871. Today, it has splintered into two theories: the "out of Africa" theory and the "multi-regional" theory.

The out of Africa theory suggests that the cradle of all humanity was Africa. Homo sapiens evolved exclusively and recently on that continent. At some point in prehistory, our ancestors migrated from Africa to Eurasia and replaced other subspecies of the genus Homo, such as Neanderthals. This is the dominant theory among scientists, and current evidence seems to support it best — though, say that in some circles and be prepared for a late-night debate that goes well past last call.

The multi-regional theory suggests that humans evolved in parallel across various regions. According to this model, the hominins Homo erectus left Africa to settle across Eurasia and (maybe) Australia. These disparate populations eventually evolved into modern humans thanks to a helping dollop of gene flow.

Of course, there are the broad strokes of very nuanced models, and we're leaving a lot of discussion out. There is, for example, a debate as to whether African Homo erectus fossils should be considered alongside Asian ones or should be labeled as a different subspecies, Homo ergaster.

Proponents of the out-of-Africa model aren't sure whether non-African humans descended from a single migration out of Africa or at least two major waves of migration followed by a lot of interbreeding.

Did we head east or south of Eden?

Not all anthropologists agree with Begun and his team's conclusions. As noted by New Scientist, it is possible that the Nikiti ape is not related to hominins at all. It may have evolved similar features independently, developing teeth to eat similar foods or chew in a similar manner as early hominins.

Ultimately, Nikiti ape alone doesn't offer enough evidence to upend the out of Africa model, which is supported by a more robust fossil record and DNA evidence. But additional evidence may be uncovered to lend further credence to Begun's hypothesis or lead us to yet unconsidered ideas about humanity's evolution.