Nailed it.

cosmology.tex

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+\documentclass{beamer}
+\usepackage[utf8]{inputenc}
+\usepackage{amsmath}
+\usepackage{unicode-math}
+\usetheme{Madrid}
+\usecolortheme{default}
+
+\title{Is modern cosmology broken?}
+\subtitle{Eh\ldots kinda?\footnote{Suck it Betteridge}}
+\author{Lauren Thomas (ljaytee)}
+
+\date{Newline 2023}
+
+\begin{document}
+\frame{\titlepage}
+
+\begin{frame}{Hubble tension. What is it? Why should I care?}
+  \begin{equation*}
+    H₀ \approx 70 \; \sf km \cdot s^{-1} \cdot Mpc ^{-1} \cdot
+  \end{equation*}
+\end{frame}
+
+\begin{frame}{Cosmic Microwave Background Radiation (CMBR)}
+  \begin{figure}
+    \centering
+    \vskip -1.5em
+    \includegraphics[angle=90,width=12cm]{cmbr.jpg}
+  \end{figure}
+\end{frame}
+
+\begin{frame}{Cosmic distance ladder}
+  \begin{figure}
+    \centering
+    \includegraphics[width=10cm]{Artist_s_impression_of_Type_Ia_supernova_pillars.jpg}
+    \caption{Artist impression. Not real image. Source: \url{https://www.esa.int/ESA_Multimedia/Images/2014/09/Artist_s_impression_of_Type_Ia_supernova}}
+  \end{figure}
+\end{frame}
+
+\begin{frame}{Gravitational lensing}
+  \begin{figure}
+    \centering
+    \includegraphics[width=5.5cm]{hst.jpeg}
+    \includegraphics[width=5.5cm]{jwst.jpeg}    
+    \caption{SMACS J0723.3-7327, HST (left), JWST (right)}
+  \end{figure}
+\end{frame}
+
+\begin{frame}{Geometry of gravitational lenses}
+  \begin{figure}
+    \centering
+    \includegraphics[width=8cm]{gravitational-lens-schematic.jpeg}
+  \end{figure}
+\end{frame}
+
+\begin{frame}{Estimates of $H_0$ in the last 5 years}
+  \begin{figure}
+    \centering
+    \vskip -0.5em
+    \includegraphics[width=7cm]{figure_4_P1.jpg}
+  \end{figure}
+\end{frame}
+
+
+%%% Local Variables:
+%%% mode: latex
+%%% TeX-master: t
+%%% End:
+\end{document}