Observed arrival · 2026-10-17
A 13.8-billion-year calendar you can play through
Cosmos Era combines an interactive cosmic calendar, a sourced science encyclopedia, and a free browser game about the evolution of life and civilization.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Readers exploring cosmic history and science fiction
- Worth noticing
- The game maps one light-year to one real hour of travel and says it does not allow faster-than-light travel.
Field notes
The calendar maps the Big Bang to January 1 and the present to the end of December 31; the page says one calendar second represents 438 real years. Its reference material spans cosmic history, life, and civilization, with cards and encyclopedia sections linking named projects and sources to topics. The game uses a separate time scale for interstellar travel, and the site says signals take as long to arrive as light would in the real distance.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
⊠LoginAccess appeared gated
$PaidCommerce or pricing visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
ƒJavaScriptBrowser-side code central
One card from the complete issue