Multifrequency Astrophysics is a pillar of an interdisciplinary approach to the knowledge of the physics of our Universe. Indeed, as clearly demonstrated in the last decades, only with the
multifrequency observations of cosmic sources is it possible to get nearly the whole behaviour of a source and then to approach the physics governing the phenomena that originate such a behaviour.
I regard a multidisciplinary approach in the study of each kind of phenomenon occurring in each kind of cosmic source as even more powerful than a simple "astrophysical approach".
Through the use of numerous space-based and ground-based experiments, our knowledge of the Universe has undergone a sharp acceleration. In this review I will try to carry out an imaginary
journey into our Universe in order to highlight the progress that has been achieved in the last decades in the knowledge of the physics that governs it.
There are many problems in performing simultaneous nultifrequency, multisite, multiinstrument, multiplatform measurements due to: (i) objective technological difficulties; (ii) sharing common
scientific objectives; (iii) problems of scheduling and budgets; and (iv) the political management of science. All these kinds of measurements converge in what is now called Multimessenger
Astrophysics, this after the detection of gravitational wave events (GWEs) and the search for the electromagnetic counterparts of such events.
I will deal, without claiming to be complete, the leading topics of astrophysics with the aim of making the current knowledge of our Universe easier for the reader.

Content:
1. Introduction
2. Our Universe
3. Hunt for planets
4. Conclusions