With the advent of string theory, new cosmological models have emerged alongside the development of a new cosmology:string cosmology. Using specific objects from string theory, branes , physicists have been able to construct innovative models describing the origin and evolution of the universe in

Predicted in 1916 by Albert Einstein as a natural consequence of general relativity, gravitational waves were definitively detected on September 14, 2015 during the merger of two black holes (1). Not only do these provide further support for Einsteins theory but, as real vibrations of space-time, ar

Even if the existence of black holes is indisputable today for the scientific community, they continue to exert a particular fascination for cosmologists as the enigmas about them still remain numerous. The question of how supermassive black holes form, in particular, is a current area of ​​active

If light and black hole seem perfectly opposite at first glance, general relativity teaches us that this is actually not quite the case. Indeed, Einsteins equations demonstrate that just like a collapsing star, light can also collapse and form a black hole. In January 1955, the American physicist

During their lifetime, stars go through several phases that are correlated to their internal dynamics. This evolution can lead them to the white dwarf stage and, subsequently, to the neutron star and black hole stages. In 1930, when he was only 20 years old, the Indian physicist Subrahmanyan Chandra

Introduced by the British physicist T. W. B. Kibble in 1976 (1), cosmic strings are topological defects that would have hypothetically formed during the first moments of the universe. The study of topological defects is a subject of interest for cosmologists because it allows a better understanding

Despite the great diversity of cosmological objects and structures, most of them share the same common point:they initially come from a gravitational collapse. This gravitational contraction is initially due to an instability within a gas cloud:the Jeans instability. The Jeans instability , also c

The universe is so incredibly large and it has an almost endless supply of worlds potentially harboring life. But then, where is all this m wave? This is called the Fermi Paradox: the disturbing scientific anomaly that, despite having billions of stars in our Milky Way galaxy (and even more outs

During the Apollo missions, 12 astronauts had the chance to walk on the Moon. However, on each outing, the teams traveled only a short distance on the lunar surface around their module, deploying deflectors and recovering rock samples. If an astronaut really wanted to walk around the Moon, how long

In the Universe, almost all objects are in motion. From comets to asteroids, stars, planets, galaxies, and even galaxy clusters, all of these objects are constantly moving. This is therefore also the case for the Earth which, in addition to evolving around the Sun, also rotates on itself. What are t

Many poets and authors speak of the unfathomable and abyssal darkness of deep space. Indeed, when our eyes turn to these vast interplanetary, interstellar, or intergalactic expanses, they encounter virtually nothing but darkness. Similarly on Earth, the star-riddled night sky also appears black to u

All matter in the Universe is made up of atoms. Each of these building blocks has a positively charged nucleus, made up of protons and neutrons, and orbiting negatively charged electrons. The number of protons, neutrons and electrons in an atom determines which element it belongs to in the periodic

The summer period rhymes with outings and beaches, but also with rest! And when you are curious by nature, thirsty for knowledge, it is essential to have at least a small list of documentaries to watch in case of intellectual distress. We offer you here some of them on the theme of space (the most e

Current astrophysical models describe the formation of planets from rotating circumstellar disks. This rotational movement is then transmitted to the protoplanet in formation by virtue of the conservation of angular momentum. All planets are therefore supposed to rotate, and the Earth is no exceptio

In 1975, as part of his work on the thermodynamics of black holes, physicist Stephen Hawking showed the existence of radiation originating near black holes and causing them to evaporate. This led him, in 1976, to expose the paradox of information:according to general relativity, any information abso

Not so easy to fall asleep on board the International Space Station (ISS). The lack of gravity first of all, but also the noise pollution due to the various instruments, without forgetting the 16 sunrises and sunsets which the crew attends each terrestrial day, here are just as many disturbing eleme

Midway through his career, Albert Einstein became convinced that his grand theory of general relativity — which describes gravity not as a force, but as the manifestation of the curvature of spacetime — had missed something. Yes, the space warped and bent, but not as he originally thought. By taking

In October 1995, a team of astrophysicists from the Observatoire de Haute-Provence discovered the first exoplanet orbiting a star similar to the Sun:51 Pegasi b. Since then, more than 4,500 exoplanets have been confirmed, in nearly 3,400 different planetary systems; several thousand candidate planet

To the time when the largest space telescope in the world James Webb starts its commissioning 1.5 million kilometers from Earth, questions about the infinitely large never cease to arise. How did galaxies form? If we have known since the 1920s that the Universe is expanding, how can we measure it a

The domain of infinity has something to fascinate, both scientists and science fiction authors. If the opinion on the existence of multiple or parallel universes divides so much, it is because nothing has yet been demonstrated. “Their existence is however the best way to answer unresolved scientific