The sponge-like Saturn moon
The sponge-like Saturn moon. Key quote:
Hyperion measures about 250kms across; it rotates chaotically and has a density so low that it might house a vast system of caverns inside.
The sponge-like Saturn moon. Key quote:
Hyperion measures about 250kms across; it rotates chaotically and has a density so low that it might house a vast system of caverns inside.