How well do you know your home planet? Assuming you live on planet Earth. If not, we come in peace. Test your home planet ...

How much do you remember about planet Earth in the news over the last 12 months? Take our quiz to find out! When you purchase through links on our site, we may earn an affiliate commission.

Population density (often abbreviated PD) is a compound measure that tells us roughly how many people live in an area of ... most densely populated cities on earth with roughly 29,650 people ...