# What can distant galaxies teach us about massive stars?

## TL;DR

This paper discusses how observations of distant, unresolved galaxies can inform and challenge models of massive stars, especially with upcoming JWST data, enhancing our understanding of galaxy evolution and stellar physics.

## Contribution

It highlights the importance of high-redshift galaxy observations for testing and refining models of massive stars in the context of galaxy evolution.

## Key findings

- Distant galaxy observations are crucial for understanding massive star roles.
- Upcoming JWST data will provide new tests for stellar models.
- Current models have uncertainties that can be constrained by high-redshift data.

## Abstract

Observations of star-forming galaxies in the distant Universe (z > 2) are starting to confirm the importance of massive stars in shaping galaxy emission and evolution. Inevitably, these distant stellar populations are unresolved, and the limited data available must be interpreted in the context of stellar population synthesis models. With the imminent launch of JWST and the prospect of spectral observations of galaxies within a gigayear of the Big Bang, the uncertainties in modelling of massive stars are becoming increasingly important to our interpretation of the high redshift Universe. In turn, these observations of distant stellar populations will provide ever stronger tests against which to gauge the success of, and flaws in, current massive star models.