As we observe it today, the universe is expanding, but we do not know if it will always continue to do so. One of the great challenges of modern cosmology is to evaluate accurately how much matter the universe contains, since this will determine how it will act in the future. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Science Source / QA International |
Taille de l’image : | 5400 px × 1797 px |
Model Release : | Non requis |
Property Release : | Non requis |
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