Update movie gear

data/astro.md

@@ -144,7 +144,10 @@ cooling and is one of the many models that are part of the [AGORA
 comparison
 project](http://adsabs.harvard.edu/abs/2014ApJS..210...14K).
 
-<div class="videowrapper"><iframe width="100%" height="100%" src="https://www.youtube.com/embed/2Afc6nBBFYw" frameborder="0" allowfullscreen></iframe>
+The following movie shows a dwarf galaxy done with our model using the zoom in technique.
+The gas is shown in blue, the stars in yellow and the dark matter in orange.
+The dwarf galaxy corresponds to h159 in Revaz & Jablonka 2018.
+<div class="videowrapper"><iframe width="100%" height="100%" src="https://www.youtube.com/embed/N9LttqUiWgA" frameborder="0" allowfullscreen></iframe>
 </div>
 
 ## Structure finder