What is the universe

the Universe” is derived from the Latin word “universum”, which was used by Roman statesman Cicero and later Roman authors to refer to the world and the cosmos 

Space and universe 

space is the part of the universe that's outside of earth's atmosphere. the word space refers to the vacuum and typically it is a void that exists between celestial objects and what is celestial objects an celestial objects also non as astronomical object it is a naturally occurring physical entity . whereas universe also refers to all celestial objects.

Existences of universe

many astronomical theories and hypothetical concepts of world's top space scientists that all existing matter and space considered as a whole; the cosmos. The universe is believed to be at least 10 billion light years in diameter and contains a vast number of galaxies; it has been expanding since its creation in the Big Bang about 13 billion years ago.but many times this theory fails and  the concept of Big Bang theory  seems to be hypothetically because many Astoria and mega stones are identified in space that more older then 13 billion years