Free Astronomy Magazine January-February 2024

4 ASTRO PUBLISHING by Michele Ferrara revised by Damian G. Allis NASA Solar System Ambassador O bservations of the early uni- verse with the James Webb Space Telescope have found astronomers faced with a rather dis- concerting reality, confirming and reinforcing what, a few years ear- lier, had been called the “impossible early galaxy problem.” It’s about the fact that a now non-negligible num- ber of galaxies, existing be- tween 500 and 800 million years after the Big Bang, show disks and ha- los similar to t ho s e Is the universe really 26.7 billion years old?