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Jan 19, 2021 · Webb will survey two fields with deep observations from Hubble and other telescopes to trace the formation and evolution of the first galaxies. Learn how Webb's infrared vision and sensitivity will reveal the cosmic history of galaxies, stars and black holes.
- NASA Science
To find the first galaxies, Webb will make ultra-deep...
- Webb/NASA
To find the first galaxies, Webb will make ultra-deep...
- NASA Science
To find the first galaxies, Webb will make ultra-deep near-infrared surveys of the Universe, and follow up with low-resolution spectroscopy and mid-infrared photometry (the measurement of the intensity of an astronomical object's electromagnetic radiation).
Jun 12, 2023 · New data from NASA's James Webb Space Telescope shows that galaxies ionized the gas around them, clearing the way for light to travel across the universe. Learn how Webb's observations of distant galaxies and quasars reveal the end of the Era of Reionization.
- Key Questions
- Webb's Role in Answering These Questions
- The Era of Recombination
- The Epoch of Reionization
Webb is addressing several key questions to help us unravel the story of the formation of structures in the Universe such as: 1. When and how did reionization occur? 2. What sources caused reionization? 3. What are the first galaxies? 4. See also our Q&A with John Mather about the Big Bang.
To find the first galaxies, Webb will make ultra-deep near-infrared surveys of the Universe, and follow up with low-resolution spectroscopy and mid-infrared photometry (the measurement of the intensity of an astronomical object's electromagnetic radiation). To study reionization, high resolution near-infrared spectroscopy is needed.
Until around a few hundred million years or so after the Big Bang, the universe was a very dark place. There were no stars, and there were no galaxies. After the Big Bang, the universe was like a hot soup of particles (i.e. protons, neutrons, and electrons). When the universe started cooling, the protons and neutrons began combining into ionized at...
Another change occurred after the first stars started to form. Theory predicts that the first stars were 30 to 300 times as massive as our Sun and millions of times as bright, burning for only a few million years before exploding as supernovae. The energetic ultraviolet light from these first stars was capable of splitting hydrogen atoms back into ...
Jan 12, 2023 · Astronomers detected 87 galaxies at high redshifts, meaning they may have been the first galaxies to appear in the universe, about 200 million to 400 million years after the Big Bang.
Jul 11, 2022 · NASA's $10 billion new telescope showed the world something remarkable today: an image of some of the first galaxies to form in the universe.
May 24, 2024 · Astronomers using the James Webb Space Telescope have found what they say are three of our universe's earliest galaxies, spotted actively forming when the cosmos was just 400 million to 600...
