This Isn't in the correct key, but what I like to play it in. Transposing the key 
down 4 half steps (so the first chord is Ab) should put it in the original key

Intro-
C5 G5 C5 F5 C5 G5 A5 F5
C5
Cheer up!
              G5                                C5                 F5
'Cause nothing really matters when you look up into outer space
              C5                     G5           A5             F5
It's a great big world, and there's no need to cry

C5
Cheer up!
              G5                         C5                 F5
We're all interconnected to the reaches of the galaxy
       C5                     G5           A5             F5
And my best friend says he came from the sky

G5
He traveled to the Earth aboard a pink space ship
G5
It's hard for him to hide behind those eyes...

C5
Cheer up!
          G5                         C5                 F5
The atoms in your body are as old as every dinosaur
             C5              G5           A5             F5
You're a special part of one big grand design

C5
Cheer up!
            G5                              C5                 F5
We're all in this together to discover what we're living for
 C5                 G5                 A5             F5
13 billion years, and there's still time

G5
Every night, I wish upon a star so bright
G5
Waiting for the others to arrive

C5
Cheer up!
               G5                               C5                 F5
'Cause nothing really matters when you look up into outer space
            C5                        G5           A5             F5
It's a great big world, and there's no need to cry
 C5                 G5                 A5             F5               C5
13 billion years, and there's still time...