It has been an exciting week with the release of breathtaking photos of our Universe by the James Webb Space Telescope (JWST).
Images such as the one below give us a chance to see faint distant galaxies as they were more than 13 billion years ago.It's the perfect time to step back and appreciate our first-class ticket to the depths of the Universe and how these images allow us to look back in time.
Our Universe is bound by the rules of physics, with one of the best-known 'rules' being the speed of light. And when we talk about 'light', we're actually referring to all the wavelengths across the electromagnetic spectrum, whichLight travels so fast that in our everyday lives, it appears to be instantaneous. Even at these breakneck speeds, it still takes some time to travel anywhere across the cosmos., you actually see it as it was 1.3 seconds ago.
Above: The electromagnetic spectrum with Hubble and JWST's ranges. Hubble is optimized to see shorter wavelengths. These two telescopes complement each other, giving us a fuller picture of the Universe. This means some of the light that would have been visible to our eyes when it was first emitted has since lost energy as the Universe expanded. It's now in a completely different region of the electromagnetic spectrum. This is a phenomenon calledAnd this is where the JWST really shines. The broad range of infrared wavelengths detectable by JWST allow it to see galaxies Hubble never could.
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