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Dernière mise à jour: 29 août 2025

Earth and its crises

A planet in perpetual motion

Earth glides silently along its orbit, carried by an immense but invisible gravitational force. From our perspective, nothing betrays this colossal dynamic: our planet follows its trajectory without ever passing exactly through the same point in space, swept along in a continuous cosmic journey.

A world that spins beneath a changing sky

Day after day, while the sky unfolds above us a scene in perpetual transformation, Earth rotates on itself with imperturbable regularity. This rotation, inherited from its formation, sets the rhythm of day and night and shapes our perception of time, with nothing seeming able to interrupt it.

A small speck of star dust facing its fragilities

Yet behind this apparent stability, Earth undergoes successive crises: climatic, geological, biological. Our planet, born from stardust, bears the traces of these upheavals that have shaped its history and condition the future of life. Understanding these crises means better grasping the fragility and resilience of this world we inhabit.

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To explore in this category

From Black Basalt to Blue Oceans: Earth's Changing Palette
Plate Tectonics: The Invisible Engine Moving the Continents
The Mystery of the Number 360: When Earth Imposes Its Geometry on the Circle
Wet-Bulb Temperature: Humanity's Climate Time Bomb
Why Doesn't Earth's Atmosphere Escape into Space?
Origins of Earth: Magmatic Chaos and the Birth of the Solid World
Earth's Atmosphere: The Invisible Shield Protecting Life
The Three Ages of Terrestrial Water: Multiple Origins
From Carbon 14 to Uranium-Lead: The Science of Dating
Major Natural Disasters: What Are the Most Likely Threats?
The Boundary of Space: Where Does It Really Begin?
536: The Year Without a Summer and the Beginning of the Late Antique Little Ice Age
The leap second: scheduled end in 2035
Planetary Alignments: A Fascinating but Relative Phenomenon
All Deserts of the World
Earth's Paleoclimates and Carbon Dioxide
What is the effect of large lakes and water reservoirs on Earth's rotation?
International Date Line
Start Date of the Seasons: A Complex Celestial Mechanism
Reversal of the Earth's magnetic field over time
3D Simulator: Revolutions of the Planets
Geological Time and Mass Extinctions: From the Ordovician to the Cretaceous
Earth History: Timeline Compressed into 24 Hours
Earth's Water: An Extraterrestrial Origin?
Reading the Sky: Understanding Declination and Right Ascension
Inversions of the Earth's Magnetic Field
Earth's Magnetosphere: The Invisible Shield
Fujita Scale: Classifying the Fury of Tornadoes
Earth's Radioactivity: The Internal Energy of Our Planet
The Deep Sea: Exploring the Deepest Ocean Trenches
Why Are Days Getting Longer?
The Depths of the Earth: From the Lithosphere to the Core
Earth's Movements: How Earth Traces Its Spiral Through the Universe?
How much is the sea level rising?
The Life of Earth: Structure and Layers of the Earth
The Eccentricity of Earth's Orbit: An Ellipse That Changes Everything
Little Ice Age: The History of a Natural Climatic Cooling
The Quest for Time: How Ancient Civilizations Used Astronomy?
Van Allen Radiation Belt: A Shield Against Cosmic Particles
Axis of rotation of the planets or obliquity
The Cosmos in Our Measure: When Man Invents the Universe
The Galilean Cut
What is the pendulum fixed relative to?
Problem of longitude at sea
World population, still gallopingin 2008
The Oldest Image of Earth from Space
Earth's Obliquity and Variations in Its Axis of Rotation
The Astronomical Unit Fixed: A Length, No Longer an Orbit
One Molecule, Three States: Solid, Liquid, Gas on a Single Planet
Simulator, the round of near-Earth cruisers
Satellites that measure underwater relief
Hadean's Hell
The First Free Flight of an Astronaut in Space
The first measurement of the Earth-Sun distance
La The Announced End of the World on December 21, 2012: A Millennial Prophecy
The Equinoxes: An Astronomical Event
Milankovitch Cycles: The Astronomical Rhythm of Earth's Climate