The universe facts

These are the questions which are stuck in our mind :-   When we talk about the universe, the first question which is fall in our mind is that what actually the universe IS ? It is very difficult question, but we might know about this question. The simple answer of this question is “the universe is everything” it includes all the space, matter and energy that all we see through our eyes off course its me and you also. Universe is nothing but it is “the totality of all space and time; all that is has been and will be.” This statement is written by Zeilik, Michael; Gregory, Stephen A.(1998).Introductory Astronomy & Astrophysics (4 th ed.). Saunders collage publishing. This sentence means that all the things which has the universe such has planets, stars, galaxies, and all the forms of matter both dark and normal matter, energy, “spacetime”. Are you thinking about why I am talking about space and time as “spacetime” because of According to modern physics, particularly the “theory o