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<h1>Planets data</h1>
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<summary>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>).</summary>
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<td colspan="3"> </td>
<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 rowspan="4" colspan="3" scope="rowgroup">Terrestrial 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 0</td>
<td>0</td>
<td> </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 rowspan="4"
colspan="2" scope="rowgroup">Jovian planets</th>
<th rowspan="2" scope="rowgroup">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>
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<th rowspan="2" scope="rowgroup">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> </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> </td>
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<th colspan="3" scope="row">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>"."</td>
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