     course_number: 2
     material:
       title: "How a lightcurve is formed"
-      text: "<p>A lightcurve is formed by taking regular observations of a star’s brightness and plotting them over time. A fraction of planetary systems have an alignment that means, when they are viewed from Earth, the planet will pass in front of its host star as it orbits. When it does so, it blocks some of the light from the star. This is called a transit. Above you can see an example of a transit lightcurve.</p>"
+      text: "<p>A lightcurve is formed by taking regular observations of a star’s brightness and plotting them over time. A fraction of planetary systems have an alignment such that, when viewed from Earth, the planet will pass in front of its host star as it orbits. When it does so, it blocks some of the light from the star. This is called a transit. Above you can see an animation of a transit lightcurve being formed.</p>"
       figure: "./images/mini-course/ph-transit-070214.gif"
       figure_credits: ""
   }

  {
    course_number: 16
    material:
      title: "How else can we discover planets?"
      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"
      text: """
        The first planets discovered using the transit method were very strange. They are gas giant planets the same size as Jupiter but so close to their star that they only take a few days to complete one orbit! There is nothing like this in our Solar System, and theories show it is impossible for a Jupiter-sized planet to form in the high temperature environment that close to a star.
        """
      figure: "./images/mini-course/slide-23.jpg"
      figure_credits: "Image credit: ESA"
