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...central region of Africa, around the equator, is bright green with lush vegetation. The reason is clearly visible as it is also almost covered by white, convective clouds in the image. These grow during the day, as the surface warms in the sunlight, and typically produce rain in the afternoons, supplying water to the plants and animals which live below. A similar process...

...central temperatures and pressures become high enough for nuclear fusion to be initiated in their cores. At this point, the clouds stop contracting further and are maintained in hydrostatic equilibrium with a balance between the inward force of gravity and the outward force due to their internal pressure. Stars are typically initially composed of about 75% hydrogen and...