I read this book when I was really little. I am about to start reading it again.
I spent the last hour turning my mental wheels and this is how I got to right now:
Apollo 18 →
history of Apollo missions →
Planetary Grand Tour →
New Horizons →
radio...

I read this book when I was really little. I am about to start reading it again.

I spent the last hour turning my mental wheels and this is how I got to right now:

Apollo 18 → 

history of Apollo missions → 

Planetary Grand Tour → 

New Horizons → 

radio waves → 

speed of light → 

Alpha Centauri → 

aging while traveling speed of light → 

twin paradox → 

Hafele-Keating experiment → 

A Brief History of Time

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