astronomy

Luminous energy and dark matter: the mysteries of the universe

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Luminous energy and dark matter: the mysteries of the universe

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 clustering. Dark Energy: Has a repulsive virtue, pushing celestial objects apart. 95% of the Universe: Made up of dark matter and dark energy. Invisible: Cannot be detected by light. … Read more

Spiral galaxies: characteristics and mysteries

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Spiral galaxies: characteristics and mysteries

IN BRIEF Spiral galaxies: a grouping of hundreds of billions of stars Disk-shaped structure and central bulb Formed by the collapse of hydrogen and helium clouds Spiraled arms influenced by giant molecular clouds Notable examples such as the Milky Way and the Andromeda Galaxy Variety of shapes: spirals, elliptical, barred, and irregular Mysteries persist, particularly … Read more