Stars and Nebulae
Types of Stars | |
Red GiantsA few stars are cooler than the Sun, but much brighter. These are the Red Giants which are formed from sun-sized stars that have burnt most of their hydrogen. Their cores contract. They begin to burn helium. The core temperature rises. Their atmospheres expand to a great size. The outer atmosphere cools to a dull red colourAround five billion years from now, the Sun will enter its Red Giant phase. [1] - [2] - [3] - [4] - [5] - [6] |
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