Page "Places in The Hitchhiker's Guide to the Galaxy" Paragraph 19

The red giant star Arcturus is home to the great Arcturan megafreighters, automated cargo carriers that transport vast quantities of goods between star systems.

So large that they eclipse a planet's sun when in orbit, they are supposedly impregnable, though Zaphod Beeblebrox somehow managed it as a child.

Former galactic president Yooden Vranx was captain of the megafreighter infiltrated by Zaphod and Ford.

Arcturus is also home to a staggering array of oversized and often deadly megafauna, from the Arcturan Megaleech to the Arcturan Megavoidwhale, the Arcturan megagnat to the Arcturan megaelephant and megapuppy, as well as the megacamel, well known by the turn of phrase " one's soul moves at the speed of an Arcturan megacamel ", presumably the reason for distilling Arcturan Mega-gin.