—Earth Age
—Sun Age
—Universe Age
🪐 Selected Object
Click a planet to explore
⚙️ Simulation
Time scale1.0×
Orbit opacity0.15
Planet scale1.4×
Show labelsOn
📖 About the Orrery
Planets orbit the Sun at distances measured in AU (astronomical units, 1 AU = 150 million km). Orbital periods obey Kepler's Third Law: T² ∝ a³. Inner planets orbit fast; the outer giants take decades to centuries.
🕐 Cosmic Calendar
Carl Sagan's Cosmic Calendar compresses the 13.8 billion year history of the Universe into a single year. Each month = ~1.15 billion years. Every second = 438 years.
Big BangJan 1, 00:00:00
Milky Way formsMar 16
Sun ignitesSep 2
Earth formsSep 21
First life on EarthSep 21
DinosaursDec 26
Homo sapiensDec 31, 22:24
NOWDec 31, 23:59:59
📡 Current Cosmic Timestamp
13.8Billion years since Big Bang
4.6Billion years Sun's age
4.54Billion years Earth's age
📅 Key Cosmic Events
⚖️ Age Comparison Key
The Universe is 13.8 billion years old. The Sun formed 4.6 Gyr ago — about one-third of cosmic history. Earth is only slightly younger than the Sun. The outer planets took millions of years to fully form.
🌡 Age in Cosmic Year (months)
🌡 Property Explorer
The canvas shows all Solar System bodies scaled by diameter (log scale), coloured by surface temperature, and positioned by distance from Sun.
📊 Selected Data