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^ ^ this is a diagram of convection where the fluid cools by loosing heat from the surface
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Liquids and gases are fluids. The particles in these fluids can move from place to place. Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy. Heat energy is transferred from hot places to cooler places by convection.

As space is a vacuum, there is no fluid present to carry heat from warmer to cooler locations therefore, no convection can take place.

Liquids and gases are fluids. The particles in these fluids can move from place to place. Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy.

convection is most affective in liquids this is because the particles start vibrating witch cause the liquid to heat up and when they stop vibrating it cools down and this is called heat transfer and this also causes kinetic energy.

The liquid or gas in hot areas is less dense than the liquid or gas in cold areas, so it rises into the cold areas. The denser cold liquid or gas falls into the warm areas. In this way, convection currents that transfer heat from place to place are set up.