Peering Through Time: The James Webb Space Telescope's Voyage to the Universe's Origins
- shreyashi sharma
- Jun 5, 2023
- 3 min read

Imagine extending our gaze beyond the boundaries of our planet, driven by a purpose greater than idle observation. One might question what purpose could surpass idle staring into the emptiness of the cosmos other than studying about our solar system and planets. Well, consider this: A telescope that functions not solely as a portal to distant lights but transports our minds across barriers of time. Ingenious, no? Specifically designed for such feats is the telescope launched among the stars bearing the namesake of a man of science. Launched by NASA, JWST (James Webb Space Telescope) is a technological marvel that boasts a colossal mirror spanning 21 feet – a mirror which is crucial for collecting as much light as possible, which aids in observing distant and faint celestial objects. Though speculation, with its optics the boundaries of the observable are pushed farther than ever before, delivering us closer to the impossible dreams of science fiction.
Moreover, the captivating feature of JWST is that it collects not merely light, but light that has been journeying for billions of years, offering clues of the universe. JWST is especially adapted to gaze far back into the history of the cosmos. While all telescopes work as a sort of time machine, the atmosphere of our planet which absorbs or scatters most of the incoming light, places confines on Earth-based telescopes. Although do keep in mind the JWST doesn't physically travel through time but observes light that has travelled through space for billions of years, effectively allowing us to see into the past.
In addition, the concepts of physics that underlie the JWST's unique time traveling ability involve the speed of light, one of the foundational laws of physics. As Einstein correctly stated, nothing outpaces light, which crosses space at 300,000 kilometres every second regardless of wavelength across the electromagnetic range. To explain this aspect better, consider this: when you look upon the moon, you see it as it was 1.3 seconds past due to the time the light requires. Though seemingly trivial, applying this same logic to more remote objects results in tremendous implications. In the photographs of the Carina Nebula captured by JWST, you view light that departed 7,500 years prior, from an era when humanity had just started to cultivate civilisation.
The JWST is not observing any ordinary moment. It seems like a cosmic time travelling machine that has been programmed to the very start of everything, prior to the big bang. How can it do this? Well, it's got a knack for seeing through cosmic dust clouds that blocked other telescopes. The JWST's infrared capabilities are what enable it to penetrate these clouds, as infrared light has longer wavelengths and is less scattered by dust compared to visible light. This suggests it can see youthful galaxies and newly born stars when they are still in their earliest phase.
It is significant to comprehend how enormous clouds of stars and gas emerged countless epochs ago. As it happens, it forms a part of an immense galactic mystery. Each bit within the cosmos, such as enormous clouds, fiery orbs, and mounds of material, possesses a unique history of our own universe and creation. These histories might be joined together to depict how our Earth evolved through the ages, from its primordial infancy to the present-day galaxy and systems we observe. Understanding these mysteries means weaving together the stories of countless cosmic elements.
This telescope comprises more than just metals and glasses. It offers a glimpse of many mysteries unknown to all people. Comparable to the early space pioneers exploring unmapped areas, however this time the undiscovered area is many lightyears away. The JWST represents our desire to know everything that exists out there and our unquenchable longing to put together the chronicle of the universe.
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