This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Voyage in Space page. en Punch ' Representation of Algol An Astronomical Reprobate Original Punch caption The star Algol behaved in most illbred manner He would advance wink and then retire For years his motion and behaviour puzzled astronomers until at last the mystery was solved by Professor Vogel who showed that Algol had associated