Reality, theory, model and standard way

“Happy is he who gets to know the reasons for things.” -Virgil (70-19 BCE) Roman poet
“Before accepting any belief one ought to follow reason as a guide, for credulity without enquiry is a sure way to deceive oneself.” — Celsus (ca. CE 170)
To understand the nature of universe, to get real picture of the universe we have to depend on (and only) ‘scientific theories and models’. This is only way because there’s no other way to explain anything properly with flavor of logic. It doesn’t allow any kind of silly dreams or imaginations or believes. Results, logics, observational proofs are the first and last say of science. Different kinds of observation, experiments and some kind of hypothesis (popular synonym ‘guess ’) jointly build up a theory. Theory is a conceptual framework; obviously mathematical framework that explains the experiment and observational results. Mathematics is the best logical figuring out system ever. Anyway there are two basic properties of a theory. One, it has to be agreed with and explain all existence observation, could be contained few arbitrary or adjustable or modifiable elements. Two, it does have capability to predict about future observation in details. This can disprove or else falsify the model if they aren’t satisfied this conditions. Any hypotheses will become a theory if it full fills these properties, till hypotheses will be considered as just a guess nothing more.
A theory can be considered as a law of nature. For describing different phenomena we use different type of theories in different purposes. Each theory describes and explicates certain properties. Thus we need to become conscious no single mathematical model or particular theory can describe every part of the universe.
We know lots of theory in other words laws of nature, we put up those with our astronomical observations. Sometime it has seen observations and our known laws not go through in similar mode, these contradict each other. That is why sometime some modifications are needed in our theories, that don’t mean we have to kick away our proven theories, it does mean it needs modification, if there’s no way to modify then that has to be rejected and has to be replaced by another newer one. In this way we get the real picture of universe-the model of universe.
Anyway, one very good comment about it, ‘“There are many hypotheses in science which are wrong. That’s perfectly all right; they’re the aperture to finding out what’s right. Science is a self-correcting process. To be accepted, new ideas must survive the most rigorous standards of evidence and scrutiny.” by Carl Sagan. Day by day we are wondering new theories and new hypothesis. As well as we are discovering new astronomical stuffs. Thus we are gathering all again and again and realizing the picture of the universe day by day. We know better than our past, in future we’ll know better than our present.