what is a nebula? the core of a massive star a cloud of gas and dust in space a swirling disk with a lot of…

what is a nebula? the core of a massive star a cloud of gas and dust in space a swirling disk with a lot of gravity the debris remaining after a supernova
Answer
Brief Explanations:
A nebula is an interstellar cloud made up of gas (mostly hydrogen and helium) and dust in space. It is not the core of a massive star, nor a swirling disk with a lot of gravity (like a black - hole accretion disk), and not specifically the debris remaining after a supernova (though supernova remnants can be a type of nebula).
Answer:
a cloud of gas and dust in space