![]() ![]() To understand how the two telescopes relate to one another, we need to look back through Hubble’s famous deep field images. JWST was designed to pick up where Hubble left off in studying the early universe. Is JWST a successor or replacement for Hubble? What does that mean? As we celebrate the release of JWST's stunning first images, let’s compare the two telescopes and explore what to expect from JWST’s images of the cosmos. While JWST is sometimes called Hubble’s replacement, NASA thinks of it as a successor. JWST built on three decades of discoveries by the iconic Hubble Space Telescope. The initial release showcased the observatory’s abilities. NASA finally released the James Webb Space Telescope’s first full-color science images on July 12. JWST will astound us for decades-and then it will be time for the Roman Space Telescope to pick up the mantle and go even deeper.The wait is over. It remains staggering, but XDF went farther in 2012 by zooming-in on the center of the UDF using Hubble’s then new infrared camera, revealing another 5,500 galaxies.Įven that’s a fraction of what JWST has now achieved. ![]() It’s one of the deepest images of the cosmos ever obtained and shows almost nearly 10,000 galaxies-all different ages, sizes, shapes and colours. Requiring 800 exposures taken 11.3 days and 400 orbits of Hubble around Earth, the original UDF was taken between September 2003 and January 2004. In terms of its impact JWST’s new image is something a rival to the iconic Hubble Ultra Deep Field (UDF) and the follow-up Hubble eXtreme Deep Field (XDF), which transformed astronomers’ view of the early universe by revealing galaxies that formed in the Fornax constellation when the universe was just 800 million years old. HubbleĪlthough the core of Pandora’s Cluster was imaged using the Hubble Space Telescope in 2014, this new flagship image from the JWST reveals previously unseen detail. Bouwens (Leiden University), and the HUDF09 Team JWST vs. Oesch (University of California, Santa Cruz), R. photographs taken of a patch of sky at the center of the original Hubble Ultra Deep Field. “There was so much detail in the foreground cluster and so many distant lensed galaxies, I found myself getting lost in the image.”Ģ012's eXtreme Deep Field, or XDF, was assembled by combining 10 years of Hubble Space Telescope. “When the images of Pandora’s Cluster first came in from Webb we were honestly a little star struck,” said astronomer Rachel Bezanson of the University of Pittsburgh in Pennsylvania, co-principal investigator on the Ultradeep NIRSpec and NIRCam ObserVations before the Epoch of Reionization (UNCOVER) program to study the region. It should help astronomers better understand how galaxies assembled in the early universe. This summer same team will use JWST’s NIRSpec instrument to measure the distance to each of the 50,000 objects. Other red sources: to be confirmed-one of which is possibly a supermassive black hole in the early universe, according to the researchers.Without the lensing by the megacluster they would remain invisible even to JWST. Red elongated arcs throughout the image: gravitationally lensed (magnified and stretched) sources-many of them galaxies from the early universe.Bright white sources surrounded by a hazy glow: the galaxies of Pandora’s Cluster-a megacluster with so much mass that its gravity warps the fabric of spacetime to create a super-magnifying glass called a “gravitational lens.”.Center-right: a foreground star in our own galaxy, which displays JWST’s distinctive diffraction spikes.Here’s what you can see in this article’s main image (above): ![]()
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