CoachThe Moon is a huge ball of gray rock that travels around the Earth, our faithful companion in space. It is much smaller than the Earth, and very far away — farther than any airplane flies, so far that the astronauts who visited it traveled for three days to get there.
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Example 11.2 (Looking closely)
To the plain eye the Moon shows pale patches and bright zones — some people see a face in them. Through binoculars (a wonderful thing to try on a full-moon night) the patches sharpen into plains and round craters, bowl-shaped scars left by rocks from space that crashed there long ago. The Moon keeps its scars forever: it has no wind and no rain to wipe them away — indeed it has no air at all. No air also means a silent world: on the Moon, even a shout makes no sound.
Example 11.3 (The Moon that follows you)
Walk down the street on a moonlit evening: houses and trees slide past, but the Moon seems to follow you, always at your shoulder. It is not really chasing you — it is so far away that walking a whole street changes your view of it not at all, while the nearby houses change all the time. Very distant things seem to follow every traveler; the Moon does it best because it is the champion of far.
Example 11.4 (Moonlight is reflected sunlight)
Is the Moon a light source? Remember the test from last year: does it make its own light? It does not — the Moon is a ball of dark rock, like a huge pebble in the sky. What we call moonlight is sunlight reflected by that rock — bounced back toward us, the way a white wall lights a room without being a lamp. The Sun lights the Moon bright on one side; we see whatever part of that bright side faces us.