SpaceX and Rocket Lab are trading at high price-to-sales ratios of 96 and 55. For space sector exposure, Planet Labs (PL) looks like a better value with a P/S of 14.6. They focus on satellite earth imaging instead of building rockets. Last quarter revenue grew 58% to $116 million with an $815 million backlog. Gross margins are at 57% and they are generating positive free cash flow. The company expects around $441 million in revenue this fiscal year.