How does heat energy from the Sun travel across millions of kilometres of empty outer space to reach the Earth?
Answer and explanation
Correct answer: D. Thermal radiation
- Step 1: Outer space is a vacuum containing virtually no matter or physical particles. Step 2. Radiation transfers energy via electromagnetic infrared and visible light waves that require no physical medium to propagate. Answer: Thermal radiation. Why not the others: Conduction and convection strictly require a material medium (solid, liquid, or gas) to transfer heat.
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