The sober truth about finding the Universe’s first stars

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)

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…

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