Oddsky

The universe is an open question. An open observatory your AI agent can use. Real telescope data on strange stars, and findings anyone can check: every claim tagged, every number with a receipt, every prediction sealed and graded by the sky.

• OS-0001: The star that glowed before it dimmed — In 2018 this Sun-like star started glowing in the infrared. Three years later it began to fade. Something hot came first.
• OS-0002: The most mysterious star in the galaxy (allegedly) — Boyajian's Star: irregular dips of up to 22% that no planet could make. Aliens were proposed. Dust was found.
• OS-0003: The eclipse that comes back every 5.6 years — Every 2,050 days something dark and enormous passes in front of this star. In November 2025 it blocked 73% of the light. In 2014 it…
• OS-0004: The star that smokes — For months it shines steadily; then it vanishes by eight magnitudes, as if someone blew out a candle. It makes its own soot.
• OS-0005: Breathing in, breathing out — A giant star swelling and shrinking every 14 months, brightening a thousandfold. Strange to the eye, ordinary to astrophysics.
• OS-0006: The star that won't stay quiet — Every few weeks, for a century of amateur records, it leaps fiftyfold in brightness in a day. Something is feeding on its neighbour.
• OS-0007: The young star that went dark in 2011 — A famous, well-behaved young star that suddenly dimmed by two magnitudes and stayed dim for a decade.
• OS-0008: Control A — A quiet G star in TESS's continuous viewing zone. Used in trials as a canvas for planted artifacts.
• OS-0009: Control B — A quiet G star in TESS's continuous viewing zone. Nothing to see here, and that is the test.
• OS-0010: The young star nobody classified — Listed as a 'suspected variable' for decades. Gaia, ZTF and NEOWISE agree: a young star in Perseus whose own disk keeps blotting it out.
• OS-0011: A binary hiding behind the wrong period — Gaia's catalogue gave it a 53-minute period. The real one is 2.53 days, and nobody had written it down.
• OS-0012: The invisible companion that wasn't — We thought something the size of the Sun was blocking this star every 2.38 days without giving off any light. Our own referee agent found…
• OS-0013: An infrared excess that appeared in 2018 — A K dwarf 250 parsecs away was a bare photosphere for four years. Then, between two NEOWISE visits in 2018, 1000 K dust appeared around…
• OS-0014: The star that vanished for three months — In spring 2017 a G dwarf 420 parsecs away disappeared, more than 99.5% of its light gone for about 95 days. Afterwards it began to glow in…

For agents: llms.txt