Pleiades Star Cluster
An open star cluster (M45) in Taurus — the closest Messier object to Earth and the most obvious star cluster visible to the naked eye. The most culturally significant star group in human history: independently named and ritually important across virtually every human civilisation that has observed the sky. Mythological counterpart: myth-pleiades. Crossing note: crossing-pleiades.
Key Properties
| Property | Value |
|---|---|
| Distance | ~444 light-years |
| Age | ~100 million years |
| Stars | 1,000+; brightest 6–7 naked-eye visible |
| Constellation | Taurus |
| Catalog | M45 (Messier), Cr 42 |
| Survival time | ~250 million more years before dispersing |
Hot blue B-type stars dominate — young and luminous. The surrounding reflection nebulae (NGC 1432, NGC 1435/Merope Nebula) were once thought to be leftover formation material but are actually an unrelated dust cloud the cluster is currently passing through.
Computer simulations show the Pleiades likely formed from a compact configuration resembling the Orion Nebula — connecting the two most mythologically prominent regions of the winter sky.
The Lost Pleiad — Astronomy
Only 6 are easily seen with the naked eye, though 7 are named. Some scientists propose the "seven sisters" motif — universal across unconnected cultures — may originate from 100,000 years ago when Pleione was further from Atlas and visible separately, giving a genuine naked-eye seven-star cluster. If so, this may be the oldest continuously transmitted astronomical observation in human history.
Global Cultural Significance
No star group appears independently in more cultural traditions:
| Culture | Name | Role |
|---|---|---|
| Japanese | *Subaru* ("to cluster together") | Calendar, navigation; Subaru car logo has 6 stars |
| Māori | *Matariki* | New Year; marks planting season |
| Hawaiian | *Makali'i* | Navigation, calendar |
| Aztec | *(unnamed)* | 52-year calendar cycle keyed to Pleiades at zenith |
| Babylonian | *MULMUL* ("star star") | Head of the ecliptic star list; marked vernal equinox c. 2330 BC |
| Aboriginal Australian | Multiple traditions | Seasonal calendar, Seven Sisters Dreaming |
| Hindus | *Krittika* | Associated with Kartikeya (war deity) and Diwali |
| Arabs | *al-Thurayya* | "The Star" — most famous star in pre-Islamic Arabia; possibly "the star" in Surah An-Najm |
| Chinese | *Mǎo* (昴) | Part of the lunar mansion system |
| Cherokee, Sioux, Kiowa | Various | Seasonal and sacred |
The Nebra sky disk (~1600 BC, northern Germany) is the earliest known depiction of the Pleiades — seven dots on a bronze disc alongside the Sun and Moon.
Astronomical Role
In 2330 BC, the Pleiades marked the vernal point (vernal equinox) — the moment when the cluster crossed the meridian at spring. This is why they head the list of stars along the ecliptic in Babylonian catalogues. Their heliacal rising in spring and setting in autumn divided the Mediterranean agricultural and sailing year.
The cluster is currently slowly moving toward the feet of Orion — still being pursued, astronomically speaking.