Which of these is true of planetary nebulae?Group of answer choicesThey are rings of material around protostars that will accrete into planets in time.They are ejected envelopes surrounding a highly evolved low mass star.They are the material which causes the eclipses in eclipsing binary systems.They are expelled by the most massive stars in their final stages before supernova.They are the envelopes that form when blue stragglers merge.

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

How do solar nebulae and planetary nebulae differ? aPlanetary nebulae result from the explosions of massive stars, whereas solar nebulae are ejected by smaller stars. bSolar nebulae are clouds of gas and dust where planets, stars, and other celestial bodies form, whereas planetary nebulae are ejected by dying stars. cPlanetary nebulae result from the explosions of planets, whereas solar nebulae result from the explosions of stars. dPlanetary nebulae result in the formation of planets, whereas solar nebulae result in the formation of stars.

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

What is the name of the object that the Sun and planets formed from? (It is a rotating cloud of gas and dust)Group of answer choicessolar nebulaOort CloudKuiper BeltAsteroid Belt

The Oort Cloud is believed to beGroup of answer choicesa flattened belt of cometary nuclei just beyond the orbit of Neptune.the circular disk of gas around the Sun's equator from which the planets formed.a spherical cloud of cometary nuclei far beyond the Kuiper Belt.the great nebula found just below the belt stars of Orion.a grouping of asteroids and meteoroids between the orbits of Mars and Jupiter.