The Scale of Everything
The universe spans approximately 93 billion light-years in diameter — and that's just the observable portion. What lies beyond our cosmic horizon remains one of the greatest open questions in science.
The Milky Way contains roughly 200–400 billion stars. The observable universe contains roughly 2 trillion galaxies. If every grain of sand on Earth represented a star in our galaxy, there would still be more galaxies than grains of sand on every beach combined.
Key Topics I Explore
Big Bang Theory
The universe began ~13.8 billion years ago from an infinitely dense singularity and has been expanding ever since.
Black Holes
Regions of spacetime where gravity is so strong that nothing — not even light — can escape the event horizon.
Dark Matter
~27% of the universe is made of dark matter — invisible to light but detectable through gravitational effects.
Dark Energy
The mysterious force (~68% of the universe) driving the accelerating expansion of spacetime itself.
Stellar Evolution
How stars are born in nebulae, live through nuclear fusion, and die as white dwarfs, neutron stars, or black holes.
Gravitational Waves
Ripples in spacetime first detected in 2015, confirming Einstein's century-old prediction from General Relativity.
A Timeline of the Universe
t = 0 — The Big Bang
All energy, matter, and space compressed into a singularity; expansion begins.
t = 380,000 yrs — First Light
Protons capture electrons forming hydrogen; the universe becomes transparent (Cosmic Microwave Background).
t = 200 million yrs — First Stars
Population III stars ignite, seeding the cosmos with heavier elements through nuclear fusion.
t = 9.2 billion yrs — Our Sun Born
The Solar System coalesces from a spinning cloud of gas and dust.
t = 13.8 billion yrs — Now
You are here — a conscious arrangement of stardust, contemplating its own origin.
"The cosmos is within us. We are made of star-stuff. We are a way for the universe to know itself."
— Carl Sagan, Cosmos"Look up at the stars and not down at your feet. Try to make sense of what you see, and wonder about what makes the universe exist."
— Stephen HawkingRecommended Resources
Cosmos: A Spacetime Odyssey
Neil deGrasse Tyson's masterpiece documentary series — a perfect entry point.
A Brief History of Time
Stephen Hawking's accessible yet profound exploration of cosmology and time.
NASA Hubble Gallery
Real photographs from the deepest corners of our observable universe.