First Stage: The star starts out as diffused clouds of gas and dust drifting through space. One of these clouds is called a ...*1 pointPlanetary nebulaMolecular cloudProtostarAccretion DisSupernovaStar

Because of the previous question, the star begins to shrink and the outer layers are cast off forming a...*1 pointsupernovaplanetary nebulaaccretion diskmolecular cloud

A shockwave passes by and the force of gravity starts to bring the gas and dust inwards; it begins to circle and forms a(n) _______.*1 pointPlanetary NebulaMolecular CloudProtostarAccretion DiscSupernovaStarSecond Stage: At the center of the swirling gas and dust, heat and pressure build up inside of the _______. Scientists find this stage using infrared telescopes. *1 pointPlanetary NebulaMolecular CloudProtostarAccretion DiscSupernovaStar

Second Stage: At the center of the swirling gas and dust, heat and pressure build up inside of the _______. Scientists find this stage using infrared telescopes. *1 pointPlanetary NebulaMolecular CloudProtostarAccretion DiscSupernovaStar

What is a planetary nebula?Group of answer choicesthe expanding shell of gas that is left when a white dwarf explodes as a supernovathe cloud of gas and dust from which protostars formthe expanding shell of gas that is blown off by a star when it becomes a white dwarfa disk of gas surrounding a protostar that may form

What begins at the moment a star is born?A cloud of dust expands exponentiallyGas collects in space A cloud of dust collapsesNuclear fusion of hydrogen into helium