Do all the colors of light in the visible spectrum span about the same wavelength

No, they don't. The wavelength increases from violet to red. No, they don't. The wavelength increases from violet to red.

Hope this helps

the earth would become to overheated and everything alive on it will eventually die from overheating. plants will eventually die as well, water will evaporate, and it will be nothing but a hot planet without anything living on it.