Physical Characteristics
Janus is extensively cratered with several craters larger than 30 km but few linear features. The Janian surface appears to be older than Prometheus's but younger than Pandora's. From its very low density and relatively high albedo, it seems likely that Janus is a very porous and icy rubble pile. The moon is also highly non-spherical.
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“Patience, that blending of moral courage with physical timidity.”
—Thomas Hardy (1840–1928)