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Heat radiates through the vaccum to reach the earth. So, Earth has certain temperature. And then what is the temperature of the vaccum between the sun and the earth through which the heat has travelled?Just out of curiosity - was that title thread from the OP? If so it's pretty explicit as a question to ask others.To answer the OP's question - it's very cold. Radiated heat is passed through the ether as infrared waves that cannot heat anything until it hits something that can absorb them and convert them to heat. Like a planet. In the same way we never see the power of the sun until it illuminates an object like a planet, using light.Household radiators use all three methods. Convection, Conduction & Radiation. They radiate to the air surrounding them, thus warming a room. In space there is no air, so are just passed as IR waves deteriating at much the same way as light does as they are similar frequencies. Hence why as we move away from the sun, it get smaller, glows dimmer and as a result the receiving planet gets colder.[STANDALONE - PLEASE ENSURE THAT YOUR THREAD TITLES ARE PHRASED AS QUESTIONS, IN-LINE WITH FORUM POLICY. THANKS. CHRIS.]