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    <title>Planet data</title>
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    <h1>Planet data</h1>

        Data about the planets of our solar system (Planetary facts taken from <a href="http://nssdc.gsfc.nasa.gov/planetary/factsheet/">Nasa's Planetary Fact Sheet - Metric</a>).

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          <th colspan="2">&nbsp;</th>
          <th scope="col">Name</th>
          <th scope="col">Mass (10<sup>24</sup>kg)</th>
          <th scope="col">Diameter (km)</th>
          <th scope="col">Density (kg/m<sup>3</sup>)</th>
          <th scope="col">Gravity (m/s<sup>2</sup>)</th>
          <th scope="col">Length of day (hours)</th>
          <th scope="col">Distance from Sun (10<sup>6</sup>km)</th>
          <th scope="col">Mean temperature (°C)</th>
          <th scope="col">Number of moons</th>
          <th scope="col">Notes</th>
          <th scope="rowgroup" colspan="2" rowspan="4">Terrestial planets</th>
            <th scope="row">Mercury</th>
            <td>Closest to the Sun</td>
          <th scope="row">Venus</th>
          <th scope="row">Earth</th>
          <td>Our world</td>
          <th scope="row">Mars</th> 
          <td>The red planet</td>
          <th scope="rowgroup" rowspan="4">Jovian planets</th>
          <th scope="rowgroup" rowspan="2">Gas giants</th>
          <th scope="row">Jupiter</th> 
          <td>The largest planet</td>
          <th scope="row">Saturn</th>
          <th scope="rowgroup" rowspan="2">Ice giants</th>
          <th scope="row">Uranus</th>
          <th scope="row">Neptune</th>
          <th scope="rowgroup" colspan="2">Dwarf planets</th>
          <th scope="row">Pluto</th>
            Declassified as a planet in 2006, but this <a href="http://www.usatoday.com/story/tech/2014/10/02/pluto-planet-solar-system/16578959/">remains controversial</a>.
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