Relativistic jets and their mysteries

Les jets relativistes et leurs mystères

IN BRIEF Relativistic jets: ejections of matter at speeds close to that of light. Source: originating from accretion disks around black holes. Observation: monitoring a black hole for 15 years by an international team of astronomers. Power: the most powerful phenomena observed in astrophysics. Structure: jets maintain a narrow structure over vast distances. Rotation: the … Read more

The paradox of information in black holes

Le paradoxe de l'information dans les trous noirs

IN SHORT Information Paradox: question about the conservation of information in black holes. Black Hole: a region of space where gravity is so strong that not even light can escape. Baldness Theorem: a black hole is described solely by mass, charge, and angular momentum. Hawking Radiation: theory that black holes can evaporate by emitting energy. … Read more

Dark energy and dark matter: the mysteries of the universe

L'énergie noire et la matière noire : les mystères de l'univers

IN BRIEF Dark matter: Makes up about 25% of the universe. Dark energy: Represents about 70% of the universe. Dark matter: Has an attractive virtue, promoting clumping. Dark energy: Has a repulsive virtue, pushing celestial objects away. 95% of the universe: Formed by dark matter and dark energy. Invisible: Cannot be detected by light. Persistent … Read more

The role of black holes in the universe

Le rôle des trous noirs dans l'univers

IN BRIEF Definition: Celestial objects with intense gravitational fields. Composition: Very compact, high mass/size ratio. Role: Impact on the growth of galaxies. Event horizon: Limit beyond which nothing can escape. Time travel: The gravity of a black hole allows for time dilation. Environment: Influence on galactic structures and their dynamics. Scientific research: Studies conducted to … Read more