It should be 60 000 000 by 60 000 000 (that is 60 million) blocks.
One of the proves is that if you go to any of the minecraft 1.8. versions and type this command: "/worldborder set >59 999 999" (so any number smaller than 60 000 000 and bigger than 0) Minecraft will resize the border but it will also show you a message that the border's size was changed from 60 million blocks (to whatever you have written).
The size of the download for Minecraft is 258 KB.
Sorry it's probaly not possible ):
The bottom of the world is the void.
It is not a seed, it is a world download. Look up dropper world download on google or minecraft forums
to play a map, open minecraft, then click singleplayer, choose the world, then click play selected world.
1000 by 1000 blocks.
When minecraft went into beta version. In alpha the world was a set size.
Almost any world is infinite but they are all the same size. :)
Minecraft blocks don't have any material value, but their dimensions are around 4cm*4cm*4cm. A fully generated Minecraft world would have a larger size than Neptune.
The size of the download for Minecraft is 258 KB.
It's a glitch. Just look at the folder for the actual size.
The latest version of Minecraft 1.8 (10/24/2014) is under 20 Megabytes but increases in size as you play, the world is infinitely growing as you explore so the size of the game can be quite different for two people.
Yes there is such thing as the Ether World in Minecraft.
A minecraft block is 1 Meter to scale in real life.
An underwater world seed for Minecraft is used to open an underwater world to play the game in.
Sorry it's probaly not possible ):
Yes, Minecraft is global.