The ecliptic is the plane of Earth's orbit around the Sun.
Absolutely random question, but I would use a large hammer and smash my rock to piece. :/
It is the theory that the landscape around took years to be made by nature so in another few years it could make new landscapes appear.
GDP, which we use right now, to see how many people have jobs, at what income, to decide how good the economy is. We could possibly use population density, as poorer countries/less developed countries tend to be more dense all around. Mainly economic things though, so GDP, income per capita. We use life expectancy, rate of literacy, freedom index..hope this helps
