Relativity Space CEO Tim Ellis is hitting back against recent comments from fellow aerospace exec Peter Beck, who called launch contracts for un-flown rockets “basically worthless” earlier this month.

Relativity Space announced Tuesday morning that it has raised an additional $650 million in private capital and that this money will fuel an ambitious agenda of 3D printing large, reusable rockets.

Relativity Space made a flurry of announcements on Wednesday about its past and future. The company is going bigger, and it has already started to do so. In an interview with Ars, the company's chief ...