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    <h1>Planet data</h1>

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      <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>).
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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>
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          <th scope="rowgroup" colspan="2" rowspan="4">Terrestial planets</th>
            <th scope="row">Mercury</th>
            <td>0.330</td>
            <td>4,879</td>
            <td>5427</td>
            <td>3.7</td>
            <td>4222.6</td>
            <td>57.9</td>
            <td>167</td>
            <td>0</td>
            <td>Closest to the Sun</td>
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          <th scope="row">Venus</th>
          <td>4.87</td>
          <td>12,104</td>
          <td>5243</td>
          <td>8.9</td>
          <td>2802.0</td>
          <td>108.2</td>
          <td>464</td>
          <td>0</td>
          <td>&nbsp;</td>
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          <th scope="row">Earth</th>
          <td>5.97</td>
          <td>12,756</td>
          <td>5514</td>
          <td>9.8</td>
          <td>24.0</td>
          <td>149.6</td>
          <td>15</td>
          <td>1</td>
          <td>Our world</td>
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          <th scope="row">Mars</th> 
          <td>0.642</td>
          <td>6,792</td>
          <td>3933</td>
          <td>3.7</td>
          <td>24.7</td>
          <td>227.9</td>
          <td>-65</td>
          <td>2</td>
          <td>The red planet</td>
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          <th scope="rowgroup" rowspan="4">Jovian planets</th>
          <th scope="rowgroup" rowspan="2">Gas giants</th>
          <th scope="row">Jupiter</th> 
          <td>1898</td>
          <td>142,984</td>
          <td>1326</td>
          <td>23.1</td>
          <td>9.9</td>
          <td>778.6</td>
          <td>-110</td>
          <td>67</td>
          <td>The largest planet</td>
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          <th scope="row">Saturn</th>
          <td>568</td>
          <td>120,536</td>
          <td>687</td>
          <td>9.0</td>
          <td>10.7</td>
          <td>1433.5</td>
          <td>-140</td>
          <td>62</td>
          <td>&nbsp;</td>
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          <th scope="rowgroup" rowspan="2">Ice giants</th>
          <th scope="row">Uranus</th>
          <td>86.8</td>
          <td>51,118</td>
          <td>1271</td>
          <td>8.7</td>
          <td>17.2</td>
          <td>2872.5</td>
          <td>-195</td>
          <td>27</td>
          <td>&nbsp;</td>
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          <th scope="row">Neptune</th>
          <td>102</td>
          <td>49,528</td>
          <td>1638</td>
          <td>11.0</td>
          <td>16.1</td>
          <td>4495.1</td>
          <td>-200</td>
          <td>14</td>
          <td>&nbsp;</td>
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          <th scope="rowgroup" colspan="2">Dwarf planets</th>
          <th scope="row">Pluto</th>
          <td>0.0146</td>
          <td>2,370</td>
          <td>2095</td>
          <td>0.7</td>
          <td>153.3</td>
          <td>5906.4</td>
          <td>-225</td>
          <td>5</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>.
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