One is the visible spectrum, as mentioned above, and the other is the radio spectrum. However, not all of the radio spectrum is useable for space communication. The available window spans from about 30 MHz to 30 GHz, although these are not absolute end frequencies.
Isaiah 43:2 (BBE) When you go through the waters, I will be with you; and through the rivers, they will not go over you: when you go through the fire, you will not be burned; and the flame will have no power over you.saiah 43:2 (CJB) When you pass through water, I will be with you; when you pass through rivers, they will not overwhelm you; when you walk through fire, you will not be scorched-the flame will not burn you.
Rafting the Colorado River through the Grand Canyon can be the trip of a lifetime. Rafts splash through more than 40 monstrous rapids, evoking shrieks of delight from its occupants. The journey is the ultimate getaway, as the river's remote location requires you to be on the river for at least a week unless you want to hike in or out of the canyon.