Experience this classic lullaby through the fresh lens of astrophysicist Julia Kregenow, PhD. Twinkle Twinkle Little Star, I Know Exactly What You Are engages the little star lovers in your life with the whimsical but real science of the stars, to a tune we all know and love.

Do you know why stars twinkle? It's time to find out!

Written to the classic melody of "Twinkle Twinkle Little Star" by an expert in astrophysics, is the perfect primer for learning exactly what those twinkling little stars are doing way up high in the sky. Discover how stars are created, what they're made of, and even what makes them look like they're twinkling.

Stars are not only great for wishing upon, but they are also spectacular examples of scientific magic. From atmospheric turbulence to fusing atoms, these delightful (more accurate!) lyrics will become your new favorite version of this classic tune. Instead of wondering what stars are, you will know for sure!

Twinkle Twinkle Little Star

I know exactly what you are

Opaque ball of hot dense gas,

million times our planet's mass,

looking small because you're far,

I know exactly what you are.