// MATTER · ELEMENT 94 / 118atoms.no/elements
Pu94
Plutonium
Pu·Z 94·Actinide·244·⭕ 11B · A Major
▸ The reading
interpretive · artVoyager 1 has been transmitting since 1977 and now sends from interstellar space on the warmth of decaying plutonium-238 — the most distant human signal is powered by this seat. On Earth its other isotope carries the gravest weight of the arsenal age. Six allotropes, wildly unstable density, no neutral readings available.
The science below is cited as science; the symbolic layers are flagged as interactive art.
⚜ Periodic Frequency
11BA Major
a seat struck in brass — testimony, not prediction
the seat has its own room on ⭕ THE OVAL TABLE — tap the code
▸ The lenses
▸ Discovery
Glenn T. Seaborg + colleagues at Berkeley — bombarded U with deuterons · United States · 1940
▸ Stellar origin
Human-made (extinct in nature)²⁴⁴Pu, with an 80-million-year half-life, is detectable in deep-sea sediments — a fingerprint of past r-process supernovae or merger events near Earth.
▸ Reactivity
Six allotropes; density jumps wildly with temperature²³⁹Pu is the workhorse weapons isotope; ²³⁸Pu powers deep-space probes via its decay heat — Voyager and Curiosity run on Pu.
▸ Applications
- Nuclear weapons (²³⁹Pu primaries)
- Radioisotope thermoelectric generators (²³⁸Pu — spacecraft)
- MOX reactor fuel
- Heavy-element research
▸ Curiosity
Voyager 1, now in interstellar space, is still powered by Pu-238 — the warmth of decaying plutonium has kept it transmitting since 1977.
▸ Related readings
a resonance drawn between readings — not a claim that they share an origin.