Space
Geography
100

What is the furthest planet away from the sun? (not including dwarf planet)

Neptune

100

What is the biggest country in the world?

Russia

200

How many planets are in the solar system (not including dwarf planets)

8

200

What is the smallest country in the world?

The Vatican city 

300

what do you need to have a galaxy?

black hole

300

approximately what is the Earth's population?

8 Billion 

400

How are black holes created?

when massive stars collapse under their own gravity at the end of their life cycle

500

What is dark matter 

 hypothetical form of matter that does not interact with light or other electromagnetic radiation, making it invisible and undetectable by direct observation.