“Somewhere, something incredible is waiting to be known” - Carl Sagan

Humanity's innate curiosity and desire of uncovering the unknown has been the spark for mankind's explorations since the beginning of time. From Columbus' expedition across the Atlantic to discover the New World, to Armstrong's first steps on the Moon's surface, we have experienced technological advancement at a lightning pace over the course of human history.

Perhaps the most enthralling of these advances has been the scientific quest to unveil the true nature of our universe - the stars, the planets and the beings that exist within it and far beyond. And now, a novel and revolutionary tool has been developed to deepen our understanding of the cosmos. The James Webb Space Telescope (JWST) developed by NASA is the largest of its kind to ever be placed in space. Launched on Christmas Day in 2021 on board the Ariane 5 rocket, it travelled 1.5 million kilometres equipped with various high-resolution and high-sensitivity instruments, allowing scientists the ability to capture detailed infrared astronomical images of our old and distant universe (NASA, 2022a).

In a matter of less than a year, the deepest infrared image known to mankind was produced. Named Webb's First Deep Field, it was unveiled by U.S. President Joe Biden on June 11th, 2022 at the White House, encapsulating never-before-seen perspectives of our universe. With this revelation, a new gateway has been opened into answering the countless questions of the early universe pondered by astrophysicists and the public alike.

Confronting viewers with an array of contrasting colours and eccentric shapes, Webb’s First Deep Field can be hard to interpret (figure 1). 

Figure 1.

Webb’s First Deep Field: SMACS 07223

Note. From/Adapted from Webb’s First Deep Field: SMACS 07223 [photo] by James Webb Space Telescope. NASA, 2022b. https://webbtelescope.org/contents/media/images/2022/035/01G7DCWB7137MYJ05CSH1Q5Z1Z?page=1&keyword=smac Copyright 2022, NASA.

But with a careful eye and some clever detective work, we can begin to decipher the secrets contained within. For example, the bright lights depicting what appear to be stars are rather entire galaxies, each a gateway to billions of stars. In addition, Webb’s Near-Infrared Camera (NIRCam) is able to capture distant galaxies with the sharpest focus to date, unravelling important features from their faint complexities. Appreciation for this image increases exponentially once we begin to comprehend the magnitude of its importance -  it depicts the galaxy cluster, SMACS 0723, exactly as it looked 4.6 billion years ago! In other words, this image is a glimpse back to a time well before humans or any life forms existed.

Amongst the myriad of initial images produced by JWST, one particular point of interest would be the Southern Ring Nebula illustrating the dying NGC 3132 star (figure 2). This can be seen through the expulsion of its gases and outer layers, producing striking imagery through Webb’s NIRCam. Viewers may also notice the bright lights representing individual galaxies in the nebula's background - again, not to be mistaken as stars. JWST’s ability to capture such a pivotal point in the trajectory of a star's life is crucial in assisting scientists to calculate the volumes of gas and dust present, as well as their unique molecular compositions.

Figure 2.

Southern Ring Nebula captured by JWST

Note. From/Adapted from Southern Ring Nebula [photo] by James Webb Space Telescope. NASA, 2022c. https://webbtelescope.org/contents/media/images/2022/033/01G70BGTSYBHS69T7K3N3ASSEB Copyright 2022, NASA.

The efforts to produce such groundbreaking images and insights into the universe did not happen overnight. The Hubble Space Telescope, launched in 1990, was an important predecessor to the JWST. Whether it was confirming the existence of black holes, or the Nobel Prize winning discovery demonstrating the accelerating rate of expansion of the universe, the Hubble Space Telescope laid the foundations for the JWST to flourish. These marvellations revealed by the JWST would also not be possible without the efforts of countless scientists to improve the technological potential of the Hubble Telescope. As a result of these developments, JWST contains a larger primary mirror, deeper infrared vision, and is optimised for longer ultraviolet and visible wavelengths, all with the aim to increase the telescope’s ability to capture profound images of our universe. 

Nonetheless, a number of hypotheses relevant to matters such as dark energy, exoplanets, and infrared astrophysics remain unanswered. As a next step forward, the Nancy Grace Roman Space Telescope is set to launch in 2027 with the capacity to produce a panoramic view two hundred times greater than the infrared view generated by Hubble and JWST.

The questions that continue to itch our minds remain limitless. As Einstein once lamented, "the more I learn, the more I realise how much I don't know”. There is still so much that remains to be discovered. However, the JWST illustrates that through collaborative scientific efforts, humankind can begin to unravel the many mysteries that govern our universe, one galaxy at a time.

References

NASAa. (2022, July 12). NASA’s Webb Delivers Deepest Infrared Image of Universe yet. https://www.nasa.gov/image-article/nasas-webb-delivers-deepest-infrared-image-of-universe-yet/ 

NASAb. (2022, July 11). Webb’s First Deep Field. Webb Space Telescope. https://webbtelescope.org/contents/media/images/2022/035/01G7DCWB7137MYJ05CSH1Q5Z1Z?page=1&keyword=smac 

NASAc. (2022, July 11). Southern Ring Nebula. Webb Space Telescope. https://webbtelescope.org/contents/media/images/2022/033/01G70BGTSYBHS69T7K3N3ASSEB