Community-created
Nothing Touching: How Things Reach Across Space
by SyavashThrough ripples, claps, the Moon and sunlight, discover what actually travels when something far away makes something else move, and why some of these influences need no matter at all.
Library
From Ripples to Empty Space
Lesson 1
The Cork on the Pond
A stone splashes into a still pond and ripples race outward toward a floating cork — but what is actually making that trip across the water?
StartLesson 2
A Clap Across the Room
A clap reaches an ear across the room in a blink — but did anything from your hands actually make that trip?
StartLesson 3
The Bell in the Jar
A ringing bell sits inside a sealed glass jar. What will you hear as a pump slowly sucks the air out?
Locked till you take the prior lessonLesson 4
What Holds the Moon?
Nothing touches the Moon, and there's almost no air between it and Earth. So how does Earth reach it?
Locked till you take the prior lessonLesson 5
A Magnet Under the Table
Slide a magnet under a table and a paperclip on top moves along. What's passing through the wood?
Locked till you take the prior lessonLesson 6
Sunlight's Empty Trip
Sunlight crosses 150 million kilometers of almost nothing to warm your face. What could possibly be carrying it?
Locked till you take the prior lessonReview and assessment
Lesson 7
Test: Nothing Touching: How Things Reach Across Space
Review the course ideas by applying them to new situations, with kind feedback after every answer.
Locked till you take the prior lesson