   {
     course_number: 16
     material:
-      title: "How else can we discover planets?"
+      title: "How else can we discover planets? - Radial Velocity"
       text: """
         <p>The transit method is a very simple and effective method for discovering planets, but it is not the only one used by astronomers. Let’s have a look at some of the other methods:</p>
-        <strong>THE RADIAL VELOCITY METHOD</strong>
+        
         <p>As a planet orbits a star its gravitational pull moves the star around. Therefore at some points the star is moving towards us and at other points it is moving away from us. We can measure the speed of this movement by examining the light from the star. When moving towards us the star’s light becomes more blue, and when moving away, more red. The faster the star is moving, the more massive the planet. For example, Jupiter moves the Sun at 12.7 m/s (slightly faster than Usain Bolt can run), whereas the effect of the Earth is 100 times smaller, making it much easier to detect larger planets.</p>
         """
       figure: "./images/mini-course/slide-16.jpg"

    material:
      title: "Hot Jupiters - Migration"
      text: """
        For the Hot Jupiters to have gotten so close to their host stars they would have to have first formed much farther out where it was colder and then migrated inwards through the system. Multiple theories on how this migration occurs have been proposed, including interactions with other material orbiting the star in the early stages of the system and gravitational scattering involving other large bodies.
        """
      figure: "./images/mini-course/slide-24.jpg"
      figure_credits: "Image credit: NASA / JPL-Caltech"

    material:
      title: "Types of stars - main sequence"
      text: """
        A star spends the majority of its active life burning the hydrogen in its core. Stars that are in this phase are known as 'main sequence' stars. Main sequence stars are split into 7 main groups named O, B, A, F, G, K and M in order from hottest to coolest. Our Sun is a G-type star, but the vast majority of stars in our galaxy are smaller, cooler M-type stars.
        """
      figure: "./images/mini-course/13-spectral-chart.jpg"
      figure_credits: "Image credit: NASA"
