India, April 2 -- More than 50 years after the Apollo missions, NASA is finally preparing to send astronauts around the Moon again with Artemis 2. While technology has improved dramatically over the years, returning humans to deep space has proven far more complex than it may seem.

According to The Conversation, The first thing to understand is that sending humans safely into space has never gotten easier, it has only gotten more complex. New technologies require years of research, development and testing before they can ever be trusted with human lives. And even then the things go wrong in ways that surprise even the most experienced engineers.

Two recent examples make this clear. Boeing's Starliner spacecraft developed thruster issues...