This article is authored by Suresh Naik, former group director, ISRO.

India’s space-tech ecosystem is expanding across rockets, satellites, components, communications and data. Here’s how the businesses work and what stock-market investors can buy.

India observed its third National Space Day, commemorating the Chandrayaan-3 lunar landing. ISRO Chairman Dr. V. Narayanan recalled the agency's humble beginnings and current…