The Universe was born from the Big Bang, and the commonly held idea is that it was an explosion starting from a particular point. Such a situation would therefore mean that there is a center from which everything began. But while tempting, this portrayal of the Big Bang is incorrect. So, if an explo

On Earth, surrounded by the atmosphere and relatively close to the Sun, water can exist stably in a liquid state anywhere on the surface of the planet. But in space, the conditions are very different:the temperature and the pressure undergo drastic variations. In this context and in such an environm

In the context of Newtonian gravity, all masses exert a force of attraction on each other, depending on the distance and the mass of each. In the context of general relativity, any mass is a source of gravity by the deformation of the geometry of space-time. So what about zero-mass particles? Are th

The first detection of gravitational waves by the LIGO interferometer ushered astrophysics into a new era of observation. The study of these space-time oscillations has led to a better understanding of certain characteristics of black holes and how these cosmic objects behave during a merger. On S

In 2019, the scientific collaboration of the Event Horizon Telescope should have finished analyzing the 27 petabytes of data relating to the two supermassive black holes at the center of the Milky Way, and M87. Once the process is complete, we should get, for the first time, the image of the event h

The experimental confirmation of the existence of gravitational waves, more than 100 years after they were predicted by Albert Einstein, ushered cosmology into a new era. So far, 11 events have been detected, allowing scientists to refine their knowledge of these true ripples in spacetime. If gravit

Dark matter represents about 85% of the total matter of the Universe, compared to 15% for baryonic matter. In the standard model of cosmology, it explains the rotation curve of galaxies and the formation of large cosmic structures. As such, it therefore interacts through gravity. So why cant it coll

In 1976, following his work on black holes, Stephen Hawking raised a paradox:according to general relativity, the information absorbed by a black hole is lost when it evaporates. However, the laws of quantum mechanics impose a conservation of information. Similarly, when two black holes merge, they

In the Universe, nothing is immutable. This is because the physical processes that affect the different masses of the cosmos are dynamic and change over time. This is the case with regard to the Solar System, as well as all other solar systems in the Universe. As the host star evolves, the planets o

Planet X would be the hypothetical planet of the Solar System located beyond Neptune, or even beyond the Kuiper belt. Recent observations of orbital disruption from trans-Neptunian objects have led astronomers to seriously consider its existence. However, despite the relative robustness of the theor

Predicted since 1916 as part of the theory of general relativity and supported for several years by indirect observations, the existence of black holes is no longer in doubt for the majority of the scientific community. . However, some scientists continue to look for alternatives to these objects, w

Once a star reaches the end of its life, several scenarios can unfold depending on its mass. If the most massive ones generally end their life in spectacular explosions to give way to neutron stars or black holes, the less massive ones usually end up in the white dwarf stage. But according to the th

Over the past 13.8 billion years, under the effect of gravity, matter has aggregated, compacted, contracted and collapsed to form hundreds of billions of objects traveling through the cosmos , alone or within gravitationally bound systems. Despite the vastness of the Universe, the trajectories of ma

The multiverse hypothesis emerges naturally from several current cosmological theories such as string theory or the theory of eternal inflation. From an ad hoc hypothesis, it has become a direct consequence of these theories and is now seriously considered by the scientific community. But if our u n

All physical systems in the observable Universe, whether objects or living beings, are made of baryonic matter, i.e. particles from the Standard Model, such as electrons and quarks. However, as early as the 1930s, the hypothesis of another type of matter beyond the Standard Model was proposed:dark m

Gamma-ray bursts (GRBs for gamma-ray bursts ) are defined as extremely energetic explosions lasting between ten milliseconds and several hours. The violence of this mechanism makes gamma-ray bursts the most energetic and luminous known electromagnetic phenomenon in the observable Universe. They most

Traveling in space is one of mans oldest dreams, but what if we could travel to the farthest reaches of the Universe? Would we continue to move forward indefinitely in a straight line without ever stopping? Or would we return to where we started after a while? When Man thought that the Earth was f

Since the commissioning of the Hubble Space Telescope and other observation instruments that followed, tens of thousands of images of the cosmos have come down to us. While a large proportion of the objects discovered can be considered close, several other objects have been observed at extreme dista

The planets of the Solar System, as well as the various exoplanets detected so far, all have a spheroid (quasi-sphere) structure, and the Earth is no exception. However, this mostly common form does not imply that it is physically impossible for a planet to possess a certain degree of flatness. F

While terrestrial telescopes have to deal with several constraints such as electromagnetic pollution and atmospheric dynamics, and space telescopes are certainly powerful but difficult to access, a lunar telescope could be the ideal compromise. While the latter would indeed have some advantages, the