When the star has hydrogen to burn, the creation of helium produces enough outward pressure to balance out the gravitational pull. In a star, gravitational force pulls all the gases towards the centre. The trouble is that the sun's core is not hot or dense enough to burn helium. Things change because the sun will have run out of hydrogen in its core – all that's left is the helium. Our solar system is just over 4.5 billion years old, so the sun is slightly more than halfway through its stable lifetime.Īfter 8 billion years of happily burning hydrogen into helium are over, the sun's life gets a little more interesting. For a star the size of ours, this phase lasts a little over 8 billion years. ![]() This means that it is in the most stable part of its life, converting the hydrogen present in its core into helium. ![]() ![]() The sun is currently classified as a "main sequence" star.
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