World Photography Day: How NASA imagery has formed our understanding of the Earth, the universe and existence

Since its inception in 1958, NASA has arguably performed the most necessary function in furthering our data of Earth, the universe and pure phenomena.

Through its mesmerizing pictures captured by spacecraft imaging gadgets and pioneering astronauts with handheld cameras, the company has compiled the premier portfolio of images which have helped us, as visible creatures, perceive our place within the cosmos.

This World Photography Day, check out a number of the most iconic of those photos, delving into why they helped form our notion of our very existence.

Man on the Moon (1969)

Just 11 years after its founding, NASA achieved what many would say was its biggest triumph: putting a man on the Moon. On July 20 1969, Neil Armstrong set foot on the lunar surface, immortalizing the moment with his famous words about taking what was a small step, but a “giant leap for mankind”.

And while the very act of a human setting foot on a celestial body that wasn’t Earth lit the fires of possibility that we could, one day, venture further into space, it was the images captured during these moments that truly opened our eyes to the realities of this ambition.

When Neil Armstrong took the shot of Buzz Aldrin meandering across the crater-ridden surface using a modified 70mm Hasselblad 500EL camera, he not only captured the glory of Apollo 11, but a frightening realization of how hostile the universe truly is.

The vast pitch-blackness of deep space behind Aldrin was a stark reminder that, despite the triumphant Moon landing, any journey to more distant destinations would be fraught with peril, regardless of how advanced our technology may ever become.

Blue Marble (1972)

By 1972 NASA was sending its sixth crewed mission, Apollo 17, to the lunar surface. Roughly five hours into the journey of astronauts Eugene A Cernan (commander), Harrison H Schmitt (lunar module pilot) and Ronald E Evans (command module pilot), someone clicked the shutter.

While NASA has always credited the Blue Marble shot to all three crew members, over the years Schmitt has maintained that he was the man behind the camera, using it to document weather patterns.

Whether or not Schmitt did, in fact, capture the frame, the image certainly served the purpose for which he claims it was taken. At a distance of some 18,300 miles from Earth, it clearly displayed Africa, the oceans and the Antarctic ice cap, in what was the first time an Apollo trajectory made it possible to photograph the south polar ice cap.

The image served as one of the early fully-illuminated color views of global cloud systems and continental interactions, helping to inspire holistic, planetary-scale climate models rather than localized weather forecasting.

Pale Blue Dot (1990)

While Neil Armstrong and Buzz Aldrin proved to us the dangers of space, the Voyager 1 spacecraft imaged its vastness. In 1990, 23 years after launching, and at an unfathomable distance of 3.7 billion miles from home, the vessel pointed its narrow-angle camera toward the inner Solar System.

At the request of the famous physicist Carl Sagan, who wanted one final photograph of our home world from afar before the onboard imaging system powered down forever, mission control – which initially worried that directly facing the Sun could destroy the camera optics – agreed.

In the frame, Earth appears as nothing more than a speck of light, much like a distant star appears to us from the planet. But the message of the image carried much greater weight than its composition. The scene redefined our perspective of the Solar System, putting before our eyes the absolute vastness of space surrounding our grain of sand in the universe.

Since then, Voyager 1 has continued its journey at a speed of roughly 37,800 miles per hour, becoming the first human-made object to cross the heliosphere and enter interstellar space, now at a distance of nearly 16 billion miles away.

Pillars of Creation (1995/2014)

A little closer to home, and in more recent history, the Hubble Space Telescope captured arguably NASA’s most iconic image: the Pillars of Creation. The famous 1995 frame depicts a trio of giant columns of cool hydrogen gas and dust in the Eagle Nebula, some 6,500 to 7,000 light-years from Earth.

These stellar nurseries are composed of dense pockets of gas collapsing under gravity, which ignites nuclear fusion and births new stars. While NASA already had a rigorous understanding of these processes by 1995, the image visualized, in mesmerizing color and clarity, how the cosmic bodies responsible for generating light are born.

Just shy of two decades later, NASA’s newer telescope, the James Webb Space Telescope (JWST), re-imaged the Pillars of Creation in even higher definition. JWST’s infrared instruments were able to peer through opaque dust that blocked Hubble’s vision, more accurately revealing newly formed stars.

Hubble Extreme Deep Field (2012)

NASA has also used space telescopes to observe newly formed galaxies and, in 2012, looked further back in time than ever before, capturing the Extreme Deep Field (XDF) image with Hubble.

The space agency pointed the telescope at a tiny section of the cosmos within the constellation Fornax, shooting more than 2,000 separate exposures over a period of 10 years.

The final composite image, which comprised roughly 23 days of total exposure time, revealed around 5,500 galaxies, capturing ancient light that traveled over 13 billion years to reach us.

Through Hubble XDF, we got to witness early galaxy assembly taking place when the universe was less than 5% of its current age, shortly after the Big Bang. The composite scene opened a window onto cosmic evolution, helping scientists better trace the timeline of celestial structures like our own Milky Way.

The future of our existential understading

Later this month, NASA will launch Nancy Grace Roman (NGRST), the latest of its space telescopes. Scientists will use its wide-area panoramic surveys as a scout, efficiently finding interesting patches of the universe to feed to Hubble and JWST’s deeper, narrower-field focus for detailed follow-up surveys.

The NGRST represents the next step in NASA’s mission to continue shaping our knowledge of the universe and our understanding of what it is to exist in this mind-boggling expanse. And, by the next World Photography Day, I’m sure the agency will be sharing new iconic images, adding to this ongoing visual lesson.

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