But the Webb telescope visible and ultraviolet wavelengths emitted by the first stars and galaxies in their elongated, heat-emitting infrared form. Infrared VisionĪs human beings, the Hubble telescope sees visible light with a little ultraviolet and infrared thrown in. Webb will constantly face the nightside of Earth as the spacecraft and planet swoop around the sun in unison. In simple words, it’ll be placed at 4 times the distance of the moon from the earth. This is where the gravitational forces of the Earth and sun balance, requiring minimal fuel for a spacecraft to stay put. Webb has bound for a more distant spot of 1 million miles away at what’s called the second Lagrange point (L2). The altitude was dictated by the capabilities of NASA’s space shuttles, which delivered Hubble to orbit and then made five service calls. The Hubble telescope circles just 330 miles overhead. That clumpy runt of a galaxy is currently the oldest and farthest object ever observed. Whereas the Hubble telescope has starred as far back as 13.4 billion years to disclose a clumpy runt of a galaxy. This light will reveal how the original stars looked 13.7 billion years ago. The Webb telescope is expected to behold light from the universe’s first stars and galaxies which is beyond Hubble’s range. Webb will be launched on an Ariane 5 rocket and because it won’t be in Earth orbit, it is not designed to be serviced by the space shuttle. Because Hubble is in Earth orbit, it was able to be launched into space by the space shuttle. The Webb’s near- and mid-infrared instruments will help study the first formed galaxies, exoplanets, and birth of stars. As the Earth orbits the Sun, Webb will orbit with it, but it will stay fixed in the same spot with relation to the Earth and the Sun.Īccording to NASA Hubble can see the equivalent of the toddler galaxies and the Webb Telescope will be able to see the baby galaxies. It will orbit the sun at about 1.5 million kilometers away from Earth. Hubble orbits around the Earth at an altitude of 570 km. Webb will be too far from Earth to repair, which is why it has gone through unprecedented testing. Astronauts famously corrected Hubble’s mirror in 1993 using Canadarm. Hubble can be repaired and upgraded while in orbit due to its location. Each of the 18 hexagonal segments is the size of a coffee table and coated with ultra-thin gold, an ideal reflector of infrared light. It’s also segmented, allowing it to fold like a drop-leaf table for launch. Webb’s mirror is made of beryllium which is a strong and lightweight metal. The Webb telescope requires the largest mirror ever launched for astronomy. This means that Webb’s instruments will work primarily in the infrared range of the electromagnetic spectrum, with some capability in the visible range. The instruments on Hubble see mainly in the ultraviolet and visible part of the spectrum that is why it observes only a small range in the infrared from 0.8 to 2.5 microns. The James Webb Space Telescope carries four scientific instruments and observes primarily in the infrared range that provide coverage from 0.6 to 28 microns. Let’s take one by one feature and discuss them, 1. Comparisons between James Webb Telescope and Hubble Telescope If we talk about the James Webb telescope, it will do things a bit differently.Īccording to a NASA fact sheet w ith its giant gold mirror and infrared light observation tools, Webb is designed to see objects 10 to 100 times fainter than what Hubble can see. Now, we could see stars and galaxies as they had never been seen before. What once was a faint and mysterious abyss became a detailed and colorful universe. Over the three decades since the famous observatory Hubble space telescope has expanded our view of the cosmos and held our attention with the stunning images it collects. James Webb Telescope’s potential is said to be 100 times more than our beloved Hubble telescope. Īccording to Webb project scientist, Klaus Pontoppidan James Webb Telescope will take amazing images, they will be better than what Hubble did. Hubble has captured galaxies merging, probed supermassive black holes, and has helped us understand the history of our universe. The Hubble Space Telescope was launched into low Earth orbit in April 1990, it has made more than 1.4 million observations, including tracking interstellar objects, capturing a comet colliding with Jupiter, and discovering moons around Pluto. Here, I will discuss all these things and will clear everything about them including the differences.Īfter project delays and launch postpones, The James Webb Space Telescope has finally been launched to space in December 25, 2021. Some people are saying that Webb is a replacement for Hubble space but others are saying it is a successor of Hubble. James Webb Telescope and Hubble Telescope both are NASA’s powerful telescopes.
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