1) What is the main condition for life to exist on exoplanets? a) Solid water b) Steam c) Liquid water d) None of the before mentioned 2) Rocky planets have greater mass, volume and gravity than gaseous ones a) True  b) False 3) An exoplanet is: a) A planet that is outside the Solar System b) A remote planet from the sun in our Solar System 4) What does a protoplanetary disk contain? a) Protostars, sand and dust  b) Black holes, sand and rocks c) Dust, gas, ice and rocks d) Plasma, gas and ice 5) How many exoplanets have been discovered so far in the Milky Way? a) More than 65,000 b) More than 5,600 c) Less than 4,000 d) 560 6) What role does gravity play in the formation of exoplanets? a) Separating particles in the proplanetary disk b) Keeping elements grouped and attracting more matter 7) The exoplanet "Proxima Centauri b" is approximately 28,000 light-years away a) True b) False 8) Factors allowing liquid water presence on exoplanets: a) Solar composition and solar activity b) Its distance from the host star and atmosphere composition of the exoplanet c) Stellar composition and protoplanetary disk

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