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Which horn saw it, and what does the single-horn detection mean?

Asked 26 Oct 2026 by ·Part of What produced the Wow! signal?·3 answers·0·0 following
Three answers, none aheadNone is ahead yet. See what would settle it.

Where it stands

Three answers have been proposed. None is ahead on the evidence yet. Three are still possible.

Why it matters

The two horns give two candidate positions three minutes apart, and the absence of the signal in the second horn means the source turned on or off within about three minutes⁠[1]. Every follow-up has had to cover both positions, and every hypothesis has to explain the switch.

Answers 3

None of these.
Not tested enough to call either way
Evidence: none yet
Still possible
Evidence: none yet
Still possible
Evidence: 1 for
Still possible

History

  1. Ehman puts forward: the positive (east) horn saw it; the source is at RA 19h25m.
  2. Ehman puts forward: the negative (west) horn saw it; the source is at RA 19h28m.
  3. Méndez et al.: the 2025 reanalysis narrows the two fields to RA 19h25m02s or 19h27m55s but cannot choose between them.For: The positive (east) horn saw it; the source is at RA 19h25m.
  4. Asked on this site
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