You've probably never thought how much the way you live on Earth depends on the size of the Sun! The Sun is a yellow dwarf: a perfect sphere of scorching plasma, generating a magnetic field 24/7. Despite being called a dwarf, its mass is 330,000 times bigger than that of the Earth! And the diameter of this giant is more than 864,000 miles! 

But what if it became a red dwarf? First of all, red dwarf stars are much colder than yellow dwarfs. So the climate all over the planet would be getting colder and colder, and it would become impossible to live too close to the North and the South poles. And quite soon, half of the planet would turn into an icy desert... 

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