A collection of gas and dust bound together by gravity is called _________. auniverse bnebula cdwarf star dgalaxy

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 DiscSupernovaStar

Which of the following is the name for a group of stars and their systems that are held together by gravity?

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

What do you call a mixture of gases and particles that surround a planet, held by gravity?

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