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    <title>Astro World 🌌</title>
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    <h1>Planets 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>).</caption>
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            <th colspan="3" 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>
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            <!-- terrestrial planets -->
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                <th scope="rowgroup" rowspan="4" colspan="3">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</td>
                    <td>0</td>
                    <td>Earth's hot sister</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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            <!-- jovian planets -->
            <th rowspan="5" colspan="2" scope="rowgroup">
                Jovian Planets
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                <th rowspan="2" scope="rowgroup">Gas giants</th>
                <th scope="row">Jupiter
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                <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>

                <!-- saturn -->
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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>Second largest planet</td>
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                <th rowspan="2" scope="rowgroup">Ice giants</th>
                <!-- uranus -->
                <th scope="row">Uranus
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                <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>The first planet discovered through a telescope</td>
                <!-- neptune -->
                <tr><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>The densest giant planet. </td>
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                <th scope="rowgroup" colspan="3">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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