Ema has raised $140 million to date and has more than 50 enterprise customers, including Google and Microsoft.
The investment comes amid Navi plans to go public.
The six startups were selected from over 2,000 applications and will receive $500,000 to $2 million each.
EtherealX is ramping engine tests and building a 150-acre rocket campus in India as it targets a 2027 launch mission.