At dawn, the Sun takes on orange colors; at the zenith, it often shines bright yellow; and at dusk it usually sports yellow-orange hues. It would be tempting then to think that the light that the Sun emits is naturally composed of wavelengths relative to yellow and orange. However, the physical real

In the standard model of cosmology, at the end of the Big Bang and the era of Planck, the early Universe entered a brief and violent phase of inflation during which it grew disproportionately. Although this hypothesis resolves certain phenomena observed in the Universe (such as homogeneity and isotr

Low Earth orbit is today saturated with spacecraft and space debris of all kinds. In addition to having to find a place to evolve in this orbit, the machines are also subject to the threat of impact with debris; phenomena that are less and less rare in space. And during these collisions, the smalles

In a few days, a cosmic event will delight all observers in the sky:a total lunar eclipse. During this event, the Sun, Earth, and Moon are precisely aligned, giving the earthly eyes a spectacle often called the Blood Moon. This name comes from the glowing hue of the moon during the eclipse. But wher

Perched on our small rocky planet covered with oceans, we learned to measure the passage of time based on the trajectory of the Earth around the Sun. A complete revolution corresponding for Man to one Earth year. However, the Earth is included in the Solar System, which itself orbits the center of t

Today, September 22, 2020, is the autumnal equinox, a term you have certainly heard many times before. But do you know what exactly an equinox is and what changes this phenomenon entails? Light on one of the astronomical events on which the mechanism of the seasons of our planet is based. An equin

In many ways, black holes and wormholes are alike. Both are solutions to the gravitational field equations of general relativity, and both are the seat of strong gravitational forces. The main difference is that no object can theoretically return after crossing the event horizon of a black hole, whi

Black holes are certainly among the strangest objects in the cosmic catalog. Predicted by Albert Einsteins general relativity equations, their existence is no longer debated today, the collaboration of the Event Horizon Telescope having released the first image of a black holes structural appearance

The gas giants of the Solar System are adorned with trappings that the Earth does not have:rings. These large annular structures around Jupiter, Saturn, Uranus and Neptune delight astronomers and sky watchers as the spectacle they offer is striking. What if the Earth had also inherited rings similar

Black holes are certainly among the most curious objects in the cosmic catalog. Although they have been studied for decades, some aspects of them still elude physicists. This is particularly the question of the interior of black holes. Point of matter concentrated in a gravitational singularity or p

The standard cosmological model describes the Big Bang as an extremely dense and hot period that the Universe would have gone through about 13.8 billion years ago, to then lead to the process of inflation and expansion that the Universe we observe today. If for a long time the mathematics of general

More than 40 years after the end of the Apollo program, NASA has decided that Man will return to the Moon in 2024 as part of the Artemis project. This return of humans to the lunar surface will make it possible, in particular, to study the feasibility of setting up colonies and developing lunar base

Astrophysics officially classifies black holes into three categories, according to their mass:stellar black holes, three intermediate black holes and supermassive black holes. But theoretical cosmology offers additional hypotheses such as micro black holes or primordial black holes (PBH). The latter

Winter is often synonymous with snow for people who are not used to seeing it all year round. While some regions of the Earth are permanently covered in snow, others hardly ever see a trace of it. Snow is defined as a precipitation phenomenon involving branched and crystallized ice particles, agglom

In the standard cosmological model, it is dark matter which, with the help of the cosmic web, would be at the origin of the formation of the large structures of the Universe such as galaxies. However, even if the galactic models have been considerably improved over the last decades, the formation an

In February 2016, physicists from the Laser Interferometer Gravitational-Wave Observatory (LIGO) reported the first observation of gravitational waves, emanating from two black holes, each about 30 times more massive than the Sun and located 1.3 billion light-years away. Physicists can therefore now

Although in the general opinion of historians, the Maya were a peaceful people, archaeological discoveries have revealed that they seemed to engage in significant internal deadly conflicts, between different political entities, with the aim of establishing a new political authority for the winning p

The fate of stars is not the same for all stellar objects in the Universe. While some will become cold corpses, others end their lives in gigantic explosions called supernovas. This is the case for white dwarfs that have passed the Chandrasekhar limit, as well as for sufficiently massive stars colla

Solar wind — a stream of high-energy charged particles from the Sun — is constantly hitting the Earth, and much of it is deflected by the Earths magnetic field. In some cases, a fraction of this flux reaches the ionosphere and causes auroras. But this constant interaction between the solar wind and

Man was first terrified of the sky, before being fascinated by it. Thus, not only did he turn his head towards the celestial vault, but he also produced representations of it that have survived until today. This is particularly the case of the celestial disc of Nebra, currently considered to be the