![The red giant star - Aldebaran.](http://static.sciencelearn.org.nz/images/images/000/003/252/full/Red_Giant.jpg?1674170381)
As medium sized stars exhaust their hydrogen content, they expand up to 100 times their original size to become red giants. The nuclear fusion reactions occurring within a red giant are H→ He and He→ C. Our Sun will follow this path over the next 5 billion years. This red giant is Aldebaran in the constellation Taurus.
Acknowledgement: NASA