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At its centre the Sun reaches temperatures of 15 million °C and it is essentially all colors mixed together, which appear to our eyes as white.  At its centre the Sun reaches temperatures of 15 million °C and it is essentially all colors mixed together, which appear to our eyes as white. 

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<p>Sound travels faster in water than in air. But it doesn't travel through a vacuum at all.</p>

Sound travels faster in water than in air. But it doesn't travel through a vacuum at all.

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<p>Oxygen can be converted into solid too. It becomes solid at a temperature below -218.79 degrees Celsius (-361.82 degrees Fahrenheit)</p>

Oxygen can be converted into solid too. It becomes solid at a temperature below -218.79 degrees Celsius (-361.82 degrees Fahrenheit)

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<p>The average temperature of a lightning bolt is 27700 degrees Celsius, or five times hotter than the temperature of the surface of the Sun, which is 5505 degrees Celsius.</p>

The average temperature of a lightning bolt is 27700 degrees Celsius, or five times hotter than the temperature of the surface of the Sun, which is 5505 degrees Celsius.

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<p>The Eiffel Tower is officially 324 meters high but it&rsquo;s height changes depending on the season. In hot summer days thermal expansion causes the metal to grow and the tower can get with more than 15cm taller.</p>

The Eiffel Tower is officially 324 meters high but it’s height changes depending on the season. In hot summer days thermal expansion causes the metal to grow and the tower can get with more than 15cm taller.

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<p>Only approximately about 10 percent of the world&rsquo;s currency is physical money, the rest only exists on computers and it is basically virtual.</p>

Only approximately about 10 percent of the world’s currency is physical money, the rest only exists on computers and it is basically virtual.

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<p>Every year, the Moon moves 3,8 cm further away from us. Because of this, the Earth is slowing down.</p>

Every year, the Moon moves 3,8 cm further away from us. Because of this, the Earth is slowing down.

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Earth's average orbital speed is about 30 kilometers per second. In other units, that's about 19 miles per second, or 67 000 miles per hour, or 110 000 kilometers per hour. Earth's average orbital speed is about 30 kilometers per second. In other units, that's about 19 miles per second, or 67 000 miles per hour, or 110 000 kilometers per hour.