Ddeugain mlynedd ers lansio llongau gofod Voyager, mae Dr Rhys Morris yn ymuno â Shân. Dr Rhys Morris joins Shân, forty years since the launch of the Voyager probes. Show more
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Ddeugain mlynedd ers lansio llongau gofod Voyager, mae Dr Rhys Morris yn ymuno â Shân. Dr Rhys Morris joins Shân, forty years since the launch of the Voyager probes. Show more
Mae Radio Cymru wedi bod yn darlledu rhaglenni ers 1977. Radio Cymru has been broadcasting to the nation since 1977.
