The life of humans on earth is full of mysteries from how we evolved to how the universe is formed. Scientists always try to find answers to these questions. Finally, scientists going to answer how the universe is with the help of a time machine. Yeah, you heard right the time machine, are you thinking that you are reading a sci-fi story, no. The name of the time machine is James Webb Space Telescope as we see in movies, we can’t travel in this machine but we can know about the universe's past.
Light Years:
Let us first know about light speed and light years. Generally, the distance between planets outside our solar system or milky galaxy is too far. It is very difficult to measure so we measure it as light years. A light year means the distance of light travel in one year. The speed of light is 3,00,000 meters per second. This speed knows as light speed. Light from our sun takes 8 minutes to reach earth. Still, if you are thinking about what this has about a time machine, it has. If any life far from thousands of light years see the earth from a super advanced telescope they don’t see us, they see dinosaurs on earth, because they see the light of that period. The same concept applies to the James Webb Space telescope, we will see past through this telescope.
The James Webb Telescope:
James Webb takes 25 years to complete with a cost of $100 billion. Nearly 20000 scientists and engineers worked on this. It is built by NASA with help of Canada and Europe Space stations. James Webb was built to explore more were its predecessors no able to do. Recently scientists release the photo of the birth of a star the and death of a star taken by James Webb. It has 2 cameras with which it took photos. It almost takes more than 120 hours to take one photo.
James Webb is also searching for the nearest exoplanet we life can be sustainable. Again, you got a question how can we can know it with a telescope then we have to go into some more scientific concepts. Light has a spectrum which has different waves divided on basis of wave light. The light we see is known as VIBGYOR. It has a very small wavelength. Plants are green in colour because chlorophyll pigment absorbs red and blue light in it and it cannot absorb green light so plants are green in colour. Same with oceans they don’t absorb blue light so they look blue. That light passes through them. Similarly, James Webb catches that light from the planet and calculates what type of substances are present on that planet. James Webb doesn’t revolve around earth; it revolves around the sun. Let's see how much more it will find out.
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