Astronomy

The study of celestial objects, the structure of the universe, and the physics of space beyond Earth.

Subcategories

• Planetary Science — Planets, moons, and small bodies of the solar system and beyond.
• Stellar Astronomy — Stars: their formation, structure, evolution, and endpoints.

Articles (2)

• Dark Matter
  Dark matter explained: the invisible mass shaping galaxies, the evidence from rotation curves and gravitational lensing, and the hunt for the unknown particle.
• The Big Bang
  The Big Bang explained: how an expanding universe began in a hot dense state, the evidence from redshifts to the microwave afterglow, and what came next.

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