I'm getting the hang of it.

 a cool bug
a pretty leaf
a DVD of The Core (2003)
a secret glade
a holographic Charizard business card
a marsh wren
a tumbleweed
11 squares packed into a larger square
a broken smoke machine
The Long Now Foundation's archive of every Animorphs book
a brightly-lit billboard
a beige electron
a sensible cheese platter
a swatch pop-out wristwatch
the gold crown Archimedes stole
a relativistic bowling ball
$30 in Yahoo
a first of its kind
a tiny pteranodon
a necklace of element samples whose symbols spell out your name
a baby hedgehog
a friend
two Andalites, one canonical
baby shoes (and baby)
a sunspot
the 3 million point line
a delicate music box
a pair of platonic solids, not quite touching
a block of scandium
a really cool data point
a rock with neat stripes
a single grain of salt
Voyager 2
a 5G seagull
a normal-looking leaf
an orb wren
Voyager 1
a single caffeine molecule
a festive but somehow unnerving holiday card from Junji Ito
a podcast episode
a friendly bee
an ink cartridge
a spiral-cut diamond
a golden radio tuned to 1.618 MHz
a burrito
a cool pair of shoes with flames on the side
a scroll lock key
a primordial black hole
a tree-filled grove and a nice spot for quiet contemplation
a guitar pick
a sixth lagrange point
a glass of heavy water
some microbial life
the Heart of the Ocean
some tin from the pantai remis mine
a sparkling gem
a Rhode Island the size of an ant
an icosahedral d10
a whale shark
a hydrogen ion
a piece of coronium (iron)
the Principality of Sealand
a piece of space shuttle food
a strangely heavy subway token
a piece of pumice
a large hadron
an asterisk
a sunken treasure
a smooth green snake
an eye in the sky
a dna base pair
a steam calliope
a pair of squirrel goggles
a sterile neutrino
a secret leaf
a stick
a normal-sized apple

How do I use a spoiler tag here?

I got to a couple different planets and found a some uprades. Also a hint with a xkcd- link which pictures a map of one of the planets.

This is so much bigger, then I expected!

Hate to say your spoiler tag doesn't seem to be working on my mobile