Both kepler and newton used math to support a heliocentric view of the universe. true false 2 points question 2 aristotle believed that the earth is made of permanent, non-perishable matter he called aether. true false 2 points question 3 aristotle was a greek philosopher who believed that the planets must move in perfect circles. true false 2 points question 4 the most abundant element in the universe is and the second most abundant element is helium, oxygen hydrogen, helium oxygen, hydrogen 3 points question 5 why do scientists believe that dark matter exists even though it cannot be seen? we can observe its gravitational effects. it is observed to emit light. we can measure its mass. 3 points question 6 which of the following is evidence used to support the big bang theory? background radiation increasing distances between galaxies both of the above 3 points question 7 a may become large enough to collapse under its own gravity and form a star. galaxy nebula black hole 3 points question 8 a is a massive object with a gravitational effect so strong that even light cannot escape it. black hole galaxy nebula 3 points question 9 black holes light and are invisible to our eyes. emit absorb radiate 3 points question 10 a star enters the red giant stage when it runs out of helium hydrogen carbon 3 points question 11 which stage of a star’s life cycle represents a time of converting hydrogen to helium in the core? red giant main sequence white dwarf 3 points question 12 in which stage does a star burn helium and convert it to carbon? white dwarf main sequence red giant 3 points question 13 a white dwarf is a core left behind by a main sequence star. hydrogen helium carbon 3 points question 14 which stage follows a main sequence star? red giant white dwarf protostar