Schuyler Erle discusses Hubble's discovery of Cepheid variable stars in the Andromeda Galaxy. The document poses questions about the visual similarities of entities that cannot observe each other. It is part of a broader exploration of cosmic phenomena.

1. The Very First Instant in Time
Schuyler Erle
Idibon, Inc.

23. Hubble’s first discovery of Cepheid variable stars in the Andromeda Galaxy

32. Why do (say) A and B look so similar if they can’t see each other yet?

47. Schuyler Erle
@schuyler
Idibon, Inc.
idibon.com