Question

The star-like objects at the edge of the universe are:
A) Comets
B) Black holes
C) Galaxies
D) Quasars

Answer 1

Hint:Here we have to examine each of the options one by one to get the answer.
The universe, including planets, stars, galaxies, black holes and all other kinds of matter and energy, is all of space and time and its contents. Although the spatial size of the whole universe is uncertain, the size of the visible universe, presently calculated to be $93$ billion light-years in diameter, can be determined.

Complete step by step solution:
Comets: Comets are cosmic snowballs orbiting the Sun with frozen atoms, rock and ashes. They are the size of a small town until frozen. It heats up and casts dust and gases into a giant glowing head bigger than most planets as a comet's orbit takes it close to the Sun.

Black holes: A black hole is a space-time area where gravity is so intense that nothing will escape from it — no particles or even electric waves such as light. The theory of general relativity suggests that to create a black hole, a sufficiently compact mass will distort space time.

Galaxies: Galaxies are sprawling dust, gas, dark matter structures, and anywhere from one million to a trillion stars bound together by gravity. It is assumed that nearly all large galaxies have super massive black holes at their cores as well.

Quasars: The star-like objects are quasars near the edge of the universe. There are incredibly large and incredibly distant celestial objects that ( $12$ billion light years away) are complex and far-off. This star-like presence in the telescope releases vast quantities of radiation material.

Hence, option D is the answer.

Note:We may be confused between a black hole and a quasar but behind a quasar is a black hole, but not every black hole is a quasar. So yes, in a sense, a quasar is only one face that a black hole might reveal.