By what method is heat energy from the sun transferred to Earth?

Heat energy from the sun is transferred to Earth through a process called radiation. Here are the steps:

1. The sun generates heat energy through a process called nuclear fusion. In this process, hydrogen atoms in the sun's core combine to form helium, releasing a large amount of energy in the form of light and heat.

2. This energy travels away from the sun in the form of electromagnetic waves. These waves do not need a medium (like air or water) to travel through, which is why they can travel through the vacuum of space.

3. Some of these waves reach Earth. When they do, they are absorbed by the Earth's atmosphere and surface, heating them up. This is why we feel warmth from the sun.

4. Some of the absorbed energy is then re-radiated back into space, but a lot of it is trapped by the Earth's atmosphere, keeping our planet warm enough to support life. This is known as the greenhouse effect.

So, in summary, the heat energy from the sun is transferred to Earth by radiation.