Nature of Universe
Samacheer describes a Big Bang about 13.7 billion years ago and a universe that continues to expand.
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Origin and Expansion of the Universe
Samacheer describes a Big Bang about 13.7 billion years ago and a universe that continues to expand.
Open article →Galaxies and the Milky Way
Galaxies contain gas, dust, stars and solar systems; our solar system lies in the spiral Milky Way.
Open article →Stars and Their Colour–Temperature Relation
Stars produce radiation through hydrogen fusion, and their visible colour changes with temperature.
Open article →Bodies and Structure of the Solar System
The solar system is the Sun and the planets, comets, asteroids and meteors held in revolution by gravity.
Open article →Astronomical Distance Units: Light Year, AU and Parsec
A light year measures light's yearly travel, AU measures the mean Earth-Sun distance, and a parsec equals 3.26 light years.
Open article →Inner and Outer Planets
Rocky inner planets and gaseous outer planets are separated by the main asteroid belt between Mars and Jupiter.
Open article →Earth: Position, Life and Motions
Earth is the third and fifth-largest planet, supports abundant life, and completes daily rotation and annual revolution.
Open article →Jupiter: Largest Planet and Fastest Rotation
Jupiter is the largest planet and completes the solar system's shortest planetary day in about 9.9 hours.
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