Reionization of the Universe
Numéro d’image : 12304171
| Illustration showing the reionization of the Universe. Following the Big Bang, the Universe was little more than a soup of charged subatomic particles and energy (top, red). As the Universe expanded and cooled, there came a point – at an age of 300, 000 years – when most of the protons and electrons had combined to form a sea of neutral hydrogen gas. This heralded the so-called Dark Ages, when the Universe became opaque. A few hundred million years later, some of the hydrogen had started to gather into stars and, in turn, galaxies and quasars. These new structures unleashed a torrent of ionizing radiation that began to ionize the remaining neutral hydrogen, beginning the so-called Epoch of Reionization. At an age of 1 billion years, the Universe became transparent again (bottom). | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Garlick, Mark |
| Taille de l’image : | 3576 px × 4888 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
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