Answer:
The correct options are:
1) Nebulae
2) Galaxy
3) Quasars
Step-by-step explanation:
Nebulae was the term used to designate objects of astronomy such as distant galaxies which where indiscernible.
A galaxy is a extensive collection of billions of stars, gas and dust that are kept together by gravitational forces.
GALAXY - A large collection of stars, dust, and gas in space. A system of millions or billions of stars held together by gravity. Examples include our own Milky Way.
Quasars are very powerful luminous objects that are located at the centers of distant galaxies hence they are among the most distant objects making them very old.