Glasgow, Scotland (CNN) -- Scotland's voters are heading to the polls Thursday to cast their ballots in a landmark referendum on independence from the United Kingdom.
There, they will face a straightforward yes/no question: Should Scotland be an independent country?
More than 4.2 million 
people have registered to vote, the largest electorate ever in Scotland,
 and turnout in the referendum is expected to be high.
A vote for independence 
would mean Scotland, with its population of about 5.3 million, splits 
from the rest of the United Kingdom, made up of England, Wales and 
Northern Ireland.
Voting can take place 
from 7 a.m. until 10 p.m. local time (2 a.m. to 5 p.m. ET) at more than 
5,500 polling stations across 32 districts nationwide, from the remote 
highlands and islands to the big cities of Edinburgh and Glasgow.