questionedithistorytranslationsWhich planets in the Solar System have no natural satellites?Mercury only3969Mercury and Venus11880Mercusy and Mars2077there are no such planets2525Only Mercury and Venus have no natural satellites.Share and bring new players to the game!correct this questionglobalquiz.orgreach: rather globalastronomyplanetsSolar SystemPlanets quizSolar System quizAstronomy quizThis is the aurora of Jupiter. What are the visible bright spots caused by?Jupiter moons. Jupiter's moons, especially Io (spot on the left), are powerful sources of auroras on Jupiter. These arise from electric currents along field lines, generated by a dynamo mechanism due to the relative motion between the rotating planet and the moving moon.Who first described the heliocentric model of the Sun and planets? ( with the Sun in the center)Aristarchus of Samos was an ancient Greek astronomer and mathematician who presented the first known model that placed the Sun at the center of the known universe with the Earth revolving around it. He was also the first one to deduce the rotation of earth on its axis. His astronomical ideas were often rejected in favor of the incorrect geocentric theories of Aristotle and Ptolemy. Nicolaus Copernicus attributed the heliocentric theory to Aristarchus.What kind of 'natural disasters' happen on the moon?Moonquakes are produced by tidal forces. Moonquakres are much less common and weaker than earthquakes, although they can last for up to an hour - a significantly longer time than terrestrial earthquakes - because of the absence of water to damp out the seismic vibrations.Where are favelas found?In Brazil. A favela is a slum in Brazil. The original favela was built in 1897 on the Morro da Providência in Rio de Janeiro by the families of soldiers returning from the war against the settlers of Canudos. Their formations were disbanded and soldiers were left with no work and place to live.