![]() This illustration compares various telescopes and how far back they are able to see. ![]() Seeing back into the cosmos Credit: NASA and and Ann Feild īecause of the time it takes light to travel, the farther away an object is, the farther back in time we are looking. Read on to explore some of the details of what these While Webb will be 1.5 million kilometers (km) away at the second Lagrange Hubble is in a very close orbit around the earth, Light collecting area means that Webb can peer farther back into time than Webb also has a much bigger mirror than Hubble. Wavelengths (though it has some infrared capability). In the infrared, while Hubble studies it primarily at optical and ultraviolet This is the other reason that Webb is not a replacement for Hubble its capabilities are not identical. Thus observations of these distant objects (like the first galaxies formed in the Universe, for example) requires an infrared telescope. ![]() In particular, more distant objects are more highly redshifted, and their light is pushed from the UV and optical into the near-infrared. Hubble's science pushed us to look to longer wavelengths to "go beyond" what Hubble has already done. After all, Webb is the scientific successor to Hubble its science goals were motivated by results from Hubble. Webb often gets called the replacement for Hubble, but we prefer to call it a successor. Livio & Hubble 20th Anniversary Team (STScI) In the infrared image, we can see more stars that weren't visible before. Comparison of the Carina Nebula in visible light (left) and infrared (right), both images by Hubble.
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