Final answer:
Radio waves are best suited for remote communication because they're cost-effective, not easily absorbed by interstellar material, and can penetrate atmospheres, while microwaves are good for carrying more data but require a clear line of sight.
Step-by-step explanation:
Radio waves are generally the best-suited type of electromagnetic wave for remote communication purposes. This is due to their lower frequency and energy, which makes them less expensive to produce in large quantities compared to other waves in the electromagnetic spectrum. Additionally, radio waves are not significantly absorbed by interstellar dust and gas, and they can easily penetrate the Earth's atmosphere as well as the atmospheres of other planets we are acquainted with.
On the other hand, microwaves, which are higher in frequency, can carry more information per unit time, making them suitable for certain types of communication, such as satellite transmissions and land-based long-distance communications. However, microwaves require a clear line of sight between the transmitter and receiver due to their short wavelengths.
When selecting a wavelength for communication, it's important to consider its ability to travel without being absorbed by obstructions and its cost-effectiveness in terms of energy requirements. Longer wavelengths require less energy to produce and are more practical for remote communications where distance and unimpeded transmission are factors to consider.