Planets and stars can be distinguished by their appearance. Planets usually shine with a steady light and move against the background of fixed stars. Stars twinkle due to atmospheric disturbances, while planets do not.
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Halley’s Comet is a famous periodic comet that orbits the Sun every 76 years. Named after astronomer Edmond Halley, it becomes visible from Earth during its closest approach and is known for its bright and spectacular appearance.
Beyond the Solar System lies the vast expanse of interstellar space, filled with stars, star systems, and other celestial objects. The closest neighboring star system is Alpha Centauri, and the region includes the Oort Cloud and various exoplanets.
The Milky Way Galaxy, or Akasha Ganga, is a vast spiral galaxy containing our solar system. It features a central bulge, spiral arms, and a surrounding halo of stars, gas, and dust, forming a bright band across the night sky.
As of now, scientists have not found definitive evidence of life elsewhere in the universe. However, the discovery of potentially habitable exoplanets and moons suggests that life could exist beyond Earth, and research continues to explore this possibility.
Beyond the Milky Way Galaxy lies a vast expanse filled with other galaxies, galaxy clusters, and cosmic structures. This includes the Local Group of galaxies, the Virgo Cluster, and the broader universe, extending infinitely with numerous celestial objects.
The Indian Astronomical Observatory in Hanle is crucial for advanced astronomical research due to its high altitude, clear skies, and minimal light pollution. It enables precise observations of celestial objects and contributes to significant discoveries in astronomy.
The Indian Institute of Astrophysics chose Hanle, Ladakh, for its observatory due to its clear skies, low light pollution, and minimal atmospheric turbulence. The high altitude also offers excellent visibility and stable weather conditions for astronomical observations.
Increasing light pollution disrupts human sleep, wildlife behavior, and ecosystems. To control it, I would use outdoor lights only when necessary, install motion sensors, and choose LED lights with proper shielding to minimize skyglow and light spill.