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    <h1>Planets Data</h1>
        <caption>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>).
            <col span="2">
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                <td colspan="2" scope="col">&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 colspan="2" rowspan="4" scope="rowgroup">Terrestrial planets</th>
                <th scope="row">Mercury</td>
                <td>Closest to the Sun</td>
                <th scope="row">Venus</td>
                <td> </td>
                <th scope="row">Earth</td>
                <td>Our world</td>
                <th scope="row">Mars</td>
                <td>The red planet</td>
                <th rowspan="4" scope="rowgroup">Terrestrial planets</th>
                <th rowspan="2" scope="rowgroup">Gas giants</th>
                <th scope="row">Jupiter</td>
                <td>The largest planet</td>
                <th scope="row">Saturn</td>
                <td> </td>
                <th rowspan="2" scope="rowgroup">Ice giants</th>
                <th scope="row">Uranus</td>
                <td> </td>
                <th scope="row">Neptune</td>
                <td> </td>
                <th colspan="2" scope="rowgroup">Dwarf planets*</th>
                <th scope="row">Pluto</td>
                <td>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>.</td>


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