When did massive structures of galaxies form?

When did massive structures of galaxies form?

Our current understanding of the Universe suggests that its largest structures, such as clusters and groups of galaxies, would have formed only within the second half of the Universe’s current age. However, today’s paper explores the proposed observational evidence that such structures may actually have began forming a lot earlier than we expected. This poses intriguing questions about the way we model the cosmos, how we interpret our observations, and whether we might need to rethink cosmology.

We’ll be counting galaxies…

We’ll be counting galaxies…

Counting the number of galaxies at a given mass in a region of space gives you the number density – something that can be really easily compared to simulations. But do our observations and theory match up? And how does looking out to higher and higher redshifts help us to better understand our Universe…