Add capture to gallery

docs/gallery.md

@@ -94,3 +94,14 @@ detectors on May 21st, 2019 (GW190521).
   - <https://www.aei.mpg.de/296843/ligo-and-virgo-catch-their-biggest-fish-so-far>
   - <https://www.ligo.caltech.edu/news/ligo20200902>
   - <https://aasnova.org/2020/09/02/ligo-virgos-newest-merger>
+
+## Visualization of a black hole scattering and capture orbit
+
+Numerical simulation of two black holes that scatter and then merge, emitting
+gravitational waves. Simulation with the SpEC code and wave extraction with the
+SpECTRE code by Oliver Long.
+
+[![bbh-capture](https://zenodo.org/records/13333571/files/frame.000006.png)](https://doi.org/10.5281/zenodo.13333571)
+
+- More images and citation: [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.13333571.svg)](https://doi.org/10.5281/zenodo.13333571)
+- Source: [nilsvu/bbh-capture-movie](https://github.com/nilsvu/bbh-capture-movie)