* Radiation doesn't travel in straight lines: Radiation from the Sun, like light and heat, can be absorbed, reflected, and scattered by the Earth's atmosphere and surface.
* Earth's interior: The Earth has a hot core, but the heat from the core doesn't radiate outward like the Sun's energy. It travels through the Earth's layers primarily through conduction and convection.
What you might be asking about:
* The Earth's atmosphere: The Earth's atmosphere is a shield against harmful radiation from the Sun, particularly ultraviolet (UV) radiation. The ozone layer, located within the stratosphere, plays a crucial role in absorbing most of the incoming UV radiation.
* Radiation from the Earth's surface: The Earth itself emits infrared radiation (heat) into space, which is part of the Earth's energy balance. This is a key factor in our planet's climate system.
To summarize:
* There isn't a specific "kilometre" measurement for radiation "through" the Earth.
* Radiation from the Sun interacts with the Earth's atmosphere and surface in complex ways.
* The Earth itself emits infrared radiation.
If you have a more specific question about radiation and the Earth, please let me know!
