These are some of the largest objects in our galaxy, measuring hundreds of light-years across.
These structures are the basic building blocks of the universe as they contain the elements which form stars and solar systems. These are some of the largest objects in our galaxy, measuring hundreds of light-years across. The emission and reflection types are bright but lack a noticeable shape while the planetary kind, named for their brightness and round shape, are produced by stars ejecting their outer layers of gas.  Neutron stars and pulsars lie at the center of the supernova remnant type. FTP, what is this interstellar cloud of dust, hydrogen gas, helium gas, and plasma which include the Eagle, Crab, and Hourglass ones.
These structures are the basic building blocks of the universe as they contain the elements which form stars and solar systems.
nebulae