Final answer:
Granules on the Sun's photosphere are typically 700 to 1000 kilometers across and last for 5 to 10 minutes, while supergranules are around 35,000 kilometers in diameter and last approximately 24 hours.
Step-by-step explanation:
The typical size of a granule, or convection cell, visible on the photosphere of the Sun is approximately 700 to 1000 kilometers in diameter.
These granules are features that result from convective currents of gas in the Sun's outer layer. Granules are seen as bright areas because they are composed of hotter gas rising from beneath the photosphere. As the gas reaches the surface and spreads out, it cools and sinks to form darker, cooler regions known as intergranular lanes.
The granules have a short lifespan, usually lasting only about 5 to 10 minutes. In contrast, supergranules are significantly larger with a diameter of about 35,000 kilometers, roughly the size of two Earths, and last for around 24 hours.