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.
I don't think that you think of me. You're on your own now, and I'm alone and free. I know that I should get on with my life. But a life lived without you could never be right. [Chorus] As long as the stars shine down from the heavens, Long as the rivers run to the sea, I'll never get over you getting over me. I try to smile so the hurt won't show. Tellin' everybody I was glad to see you go. But the tears just won't go away (won't go away) Loneliness found me, looks like it's here to stay.