#cosmology

5 articles

Dark Energy: Why the Universe Speeds Up

Dark energy makes up about 68% of the universe and drives its accelerating expansion — a pressure of space itself, opposite in effect to gravitating dark matter.

10 min read·Aug 25, 2026

Astronomy & Cosmology

The Expanding Universe

Distant galaxies recede faster the farther they are, yet there is no centre and no edge. Run the picture backward and you arrive at a hot dense beginning whose afterglow still fills the sky at 2.725 K.

10 min read·Jul 19, 2026

Astronomy & Cosmology

The Cosmic Distance Ladder

Distance is not something a telescope sees directly. From nearby stars to the edge of the observable universe, every distance is built on a ladder — geometric parallax, then standard candles, then redshift — where each rung borrows its calibration from the one beneath it.

10 min read·Jul 4, 2026

Astronomy & Cosmology

The Cosmic Microwave Background

Point a radio antenna at any patch of empty sky and you pick up the afterglow of the hot dense beginning — a near-perfect 2.725 K blackbody, redshifted from a 3000 K glow, whose faint ripples are the seeds of every galaxy.

10 min read·Jul 3, 2026

Astronomy & Cosmology

Galaxies and Dark Matter

Vera Rubin's flat rotation curves, gravitational lensing, and the Bullet Cluster all point to the same conclusion: galaxies are embedded in vast halos of unseen mass that gravitates but does not shine.

10 min read·Jul 3, 2026