     material:
       title: "A brief history of Exoplanets"
       text: """
-        The idea of planets orbiting other stars in our galaxy has been around for hundreds of years (in fact 16th century Italian astronomer Giordano Bruno was burnt at the stake at least in part for his beliefs on the matter!). However, it was not until 1992 that the first exoplanet was confirmed. It was found orbiting a pulsar, the rapidly-spinning, dense core of a dead star. The first confirmed planet orbiting a Sun-like star, 51 Pegesi b, was announced in 1995. Since then over one thousand exoplanets have been confirmed and many more candidates identified. The graph above shows the distribution of planet candidates discovered by the Kepler mission as of November 2013.
+        The idea of planets orbiting other stars in our galaxy has been around for hundreds of years (in fact 16th century Italian astronomer Giordano Bruno was burnt at the stake at least in part for his beliefs on the matter!). However, it was not until 1992 that the first exoplanet was confirmed. It was found orbiting a pulsar, the rapidly-spinning, dense core of a dead star. The first confirmed planet orbiting a Sun-like star, 51 Pegesi b, was announced in 1995. Since then over one thousand exoplanets have been confirmed and many more candidates identified. The graph below shows the distribution of planet candidates discovered by the Kepler mission as of November 2013.
         """
       figure: "./images/mini-course/8-size-candidates.jpg"
       figure_credits: "NASA"

      title: "False-positives - Eclipsing binary stars"
      text: """
        One of the most common false-positives we have to deal with are eclipsing binary stars. This is when another star is transiting, rather than a planet. These tend to produce much deeper transits due to stars being much larger than planets, and they also show secondary eclipses, when the smaller star passes behind the larger star (see the diagram below). However, there a few ways in which an eclipsing binary system can mimic a transiting planet. Firstly, if the second star is only partially transiting the disc of the first star then the amount of light blocked is smaller and the depth of the transit may be similar to that caused by a planet. This is called a ‘grazing eclipsing binary’.

        """
      figure: "missing"
      figure_credits: ""

        <div style=\"text-align: center;\">
          <img style=\"width: 75px; padding: 20px\" src=\"./images/mini-course/keplers-third-law.png\"/>
        </div>
        <p>
          A planet the size of Jupiter will cause a 1% dip in the brightness of a star the size of our Sun. An Earth-sized planet would only cause a 0.1% dip, making it much harder to detect! However, if the star is much smaller than our Sun, which the majority of the stars in our galaxy are, the dip in light will be larger.
        </p>
      """
      figure: "./images/mini-course/light-curve-period.png"
      figure_credits: "Image courtesy of NASA"
