Exposition

The oppressive heat of the El Paso summer was stifling, and the air was so still, she could almost hear the sweat rolling off her brow. The mid-afternoon desert sun beat down on her from above, and was reflected back to her from below by a silent sea of sand. She was impressed by how small it was. She had always imagined the desert as a place where the sun loomed, large and menacing, but she found it now a small, intensely bright disc, impossibly high, seemingly light years away.
"Well, light minutes", she said, to no one in particular.

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Newsflash: It's hot.
By the way, should it be "disc" there, or "disk"? I know both spellings are correct, but I'm never sure which one to use. I went with "disc" because it's like "discus", but I could be way off.