What would happen if you replaced the sun with aldebaran?

If Aldebaran, a red giant star, replaced the Sun, the solar system would undergo catastrophic changes. Aldebaran is much larger and more luminous than the Sun, which would result in extreme increases in temperature and radiation, making Earth uninhabitable. The gravitational dynamics of the solar system would also shift, likely disrupting the orbits of planets and potentially ejecting some from the system entirely. Overall, life as we know it would be impossible under the influence of Aldebaran.