The high-redshift galaxy RXJ2129-z8HeII contains an ionized helium feature as well as a severely blue tilt to its stellar spectrum. However, it contains extremely large quantities of oxygen, making it a terrible candidate for pristine material based on the current evidence. (Credit: X. Wang et al., submitted to Nature, 2022; arXiv:2212.04476)
The Universe certainly formed stars, at one point, for the very first time. But we haven’t found them yet. Here’s what everyone should know.
In this Universe, there are many things that we’re certain must exist, even though we haven’t discovered them just yet. These gaps in…
