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Oxygen can be a solid
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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Sound in vacuum
Sound travels faster in water than in air. But it doesn’t travel through a vacuum at all.
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Temperature of the sun
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.