What is Astronomy?
Astronomy is the scientific study of celestial objects, phenomena, and the universe as a whole. It explores the mysteries of space, from the smallest particles of cosmic dust to massive galaxies and beyond. Rooted in curiosity and observation, astronomy helps us understand the origins, evolution, and structure of the universe.
Celestial Bodies:
1. Stars: Giant nuclear reactors, like our Sun, that produce light and energy.
2. Planets: Rocky or gaseous spheres orbiting stars, including those in our solar system.
3. Moons: Natural satellites that revolve around planets.
4. Asteroids & Comets: Remnants of the early solar system.
Cosmic Phenomena:
1. Black Holes: Regions of space with gravitational pull so strong that nothing can escape.
2. Supernovae: Explosive deaths of massive stars, creating spectacular cosmic fireworks.
3. Nebulae: Giant clouds of gas and dust where stars are born.
Planets
A planet is a celestial body that meets the following critera set by International Astronomical Union (IAU) in 2006.
1. Orbits the Sun (or another star in the case of exoplanets)
2. Sufficient Mass for a Nearly Round Shape
3. Has Cleared Its Orbital Neighborhood
Stars
Stars are massive celestial bodies made of plasma, producing energy through nuclear fusion.