Here’s a video from Space X on their vision for a ship that can go to Mars and back as soon as 2025:

According to KurzweilAI:

In a talk on Tuesday at the International Astronautical Congress in Guadalajara, Mexico, SpaceX CEO Elon Musk laid out engineering details to establish a permanent, self-sustaining civilization of a million people on Mars, with an initial flight as soon as 2024.

SpaceX is designing a massive reusable Interplanetary Transport System spacecraft with cabins. The trip would initially cost $500,000 per person, with a long-term goal of 100 passengers per trip.

Musk plans to make humanity a “multiplanetary species” to ensure survival in case of a calamity like an asteroid strike. “This is really about minimizing existential risk and having a tremendous sense of adventure,” he said.