Comets don't technically *emit* radiation in the way that stars or radioactive materials do. Instead, they reflect sunlight and emit some radiation as a result of interaction with the Sun's radiation. Here's a breakdown:

1. Reflected Sunlight:

- The most prominent radiation from a comet is reflected sunlight. This includes visible light, infrared radiation, and ultraviolet radiation.

- The dust and ice particles in a comet's coma and tail scatter and reflect sunlight, making them visible to us.

2. Emission due to Solar Radiation:

- When a comet gets close to the Sun, its ice and dust are heated and vaporized.

- This process releases:

- Thermal infrared radiation: As the comet warms up, it emits infrared radiation.

- Ultraviolet radiation: Some of the gases released from the comet absorb and then re-emit UV radiation.

- Radio waves: The interaction of solar radiation with the comet's coma can generate radio waves.

- This emission is usually much weaker than the reflected sunlight.

3. No Radioactive Emission:

- Comets are not radioactive and do not emit radiation like gamma rays or X-rays.

In summary:

Comets primarily reflect sunlight and emit some radiation due to their interaction with the Sun. They do not emit radiation in the same way as stars or radioactive sources.