1. Optical: This is the portion of the spectrum that our eyes can see. It includes visible light, which makes it ideal for studying stars, galaxies, and other celestial objects.
2. Radio: Radio waves are less affected by the Earth's atmosphere than other wavelengths. They can penetrate clouds and even see through dust and gas clouds in space, making it possible to study objects that are obscured in optical wavelengths. Radio astronomy is particularly useful for studying cold objects like interstellar gas and dust, as well as distant galaxies.
While other regions of the electromagnetic spectrum are also studied from Earth, these two are the most accessible and provide a wealth of information about the universe.
