 What are Hathaway and Marnagan's physiques like?
The picture of Marnagan hunched huge over the control-console, wrenching levers, jamming studs with freckled fists. And out in the dark of the fore-part there was space and a star-sprinkling and this meteor coming like blazing fury. It made a spiked fist and knocked the rear-jets flat, and the ship spun like a cosmic merry-go-round. Hathaway only knew he was picked up and hurled against a lever-bank, and that Marnagan wasn't long in following, swearing loud words. A sweeter one still of Marnagan beating hell out of the controls and keeping his words to himself until just now. "Is this what ?" yelled Marnagan inside his helmet. They both waited, thrust against the shipside and held by a hand of gravity; listening to each other's breathing hard in the earphones. Hathaway felt himself grabbed; he and Marnagan rattled around—human dice in a croupier's cup. They stood in the middle of a pocked, time-eroded meteor plain that stretched off, dipping down into silent indigo and a rash of stars. "If we walk in opposite directions, Click Hathaway, we'd be shaking hands the other side of this rock in two hours." Oh, God, this would make great news-release stuff if we ever get back to Earth. It's times like this when we all need words, any words, on our tongues.
 Both of their appearances are described to some degree, and Marnagan is often described as being a large presence.
 There isn't much discussion about how either person looks at all.  Marnagan is consistently described as feeble in comparison to Hathaway.  Both of their appearances are described to some degree, and Marnagan is often described as being a large presence.  Both are each regularly described as having similar builds.