 What was Sanderson studying?
He had no stomach for mysteries, vast or trifling, and there were pressing things to think about at this time. Across to the right was a group that Baron knew vaguely—Andean climbers, or at least two of them were. I guess I was about ten when Wyatt and Carpenter made the last attempt—that was in 2082, I think. After that, I followed Sanderson’s work in the Twilight Lab up there and began to get Brightside into my blood, sure as death. He was a major in the Interplanetary Service for some years and hung onto the title after he gave up his commission. He was with Armstrong on Mars during his Service days, did a good deal of the original mapping and surveying for the Colony there. I first met him on Venus; we spent five years together up there doing some of the nastiest exploring since the Matto Grasso. I’d always liked the Major—he was big and quiet and cool, the sort of guy who always had things figured a little further ahead than anyone else and always knew what to do in a tight place. We spent an evening here at the Red Lion, talking about old times; he told me about the Vulcan business, and how he’d been out to see Sanderson and the Twilight Lab on Mercury, and how he preferred a hot trek to a cold one any day of the year—and then he wanted to know what I’d been doing since Venus and what my plans were.
 The Sun
 The Brightside  The Darkside  The twilight zone  The Sun