List and describe the 4 steps of diffusion that TV went through in the mid-twentieth century.

ń, wǒ shuō yīngyǔ, dàn wǒ huì shuō qítā yǔyán, rú xībānyá yǔ fǎyǔ yìdàlì yǔ hé pǔtōnghuà, suǒyǐ bùyào pànduàn, dànshì

i think it's a but not entirely sure

because the sun creates the shadows and its only what people on earth see in the sky which are the phases of the moon.