What's the Sun?

This is the ninety-first lesson of our Big Course — the inaugural lesson of Year 4, and the first day of the SECOND HALF OF THE BIG COURSE.

And, hey hey, we're stepping things up!

Along the way to the answer, you'll get a reminder on whether "up" and "the sky" are real, get "embiggened" up to Gigaworld to see how big the Sun (and the planets, and the other stars) really are, and see what happens when you punch the Sun. By the end, you'll have drawn the first-ever accurate picture of what the Sun fundamentally is.