Which of the quotes below suggest a theme in The First Men in the Moon?

"Those who have only seen the starry sky from the earth cannot imagine its appearance when the vague, half luminous veil of our air has been withdrawn."
"I stared at the paper for a moment, then held it above the level of my face, and found I could read it quite easily. I struck a column of mean little advertisements."
"By the way," I asked, "how small a thing will the biggest telescopes show upon the moon?"
"In that night there must be cold, the ultimate cold, absolute zero, 273 degrees Centigrade, below the earthly freezing point."