Is our planetary system heliocentric or geocentric

Read the article titled "trans-saharan migration routes to north africa and the eu: historical roots and current trends." why do tens of thousands of sub-saharan africans try to cross the mediterranean each year? how are these refugees commonly portrayed? (site 1)

Ray lo bisects nlm, lm=18, no=4, and ln=10. what is the value of x?

The graph below plots the temperature and luminosity of stars on the main sequence.