     material:
       title: "The first Planet Hunters planet"
       text: """
-        The first confirmed planet discovered by volunteers, like you, on Planet Hunters was PH1b (also known as Kepler-64b). It is a Neptune-sized giant planet with a radius 6 times greater than that of the Earth. The really interesting thing about PH1b is that it’s a circumbinary planet, meaning it orbits around two stars! Those two stars are also in orbit around another binary star system, which makes PH1b the first planet ever discovered in a quadruple star system. Below is an artist’s impression of the system.
+        The first confirmed planet discovered by volunteers, like you, on Planet Hunters was PH1b (also known as Kepler-64b). It is a Neptune-sized giant planet with a radius 6 times greater than that of the Earth. The really interesting thing about PH1b is that it’s a circumbinary planet, meaning it orbits around two stars! Those two stars are also in orbit around another binary star system, which makes PH1b the first planet ever discovered in a quadruple star system. Above is an artist’s impression of the system.
         """
       figure: "./images/mini-course/9-FirstPlanet.png"
       figure_credits: "Image Credit: H. Giguere, M. Giguere"

        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: ""

  }


    material:
      title: "How else can we discover planets? - Astrometry"
      text: """
        As described before for the radial velocity method, stars are pulled around by the gravitation force from their orbiting planets (see animation above). Therefore, if the position of a star can be measured accurately, this movement can be observed and the existence of the planet can be confirmed. These movements are extremely small and to-date very few exoplanet candidates have been discovered in this way, however the recently launch Gaia spacecraft plans to utilise this method as part of its mission.
        """
      figure: "./images/mini-course/slide-21.gif"
      figure_credits: ""
