The development of the Sun|
When the Sun was created 4.6 billion years ago it had gone through a stage when it had been much cooler and larger than today.
On the other hand it shone up to 100 times more strongly than today.
|How has the Sun changed since birth?|
|At its birth the Sun had shrunk to a “normal” star, but it was not quite like the present Sun.
It emitted 36 % less energy than it does today.
|Climatic impact on the Earth|
|Because of the atmosphere and the oceans the temperature on the Earth may in fact increase faster in the future than the Sun’s increase of radiation indicates.|
|The reserves of hydrogen in the nucleus are being emptied|
|Finally the nucleus of the Sun will run short of fuel. The pressure in the nucleus will sink and the gravitation forces will gain ascendancy. This will cause the nucleus of the Sun to shrink – it will become denser and warmer.|