NASA's dream of a space plane could finally become reality

• Space planes could become a reality if one company achieves its goal.
• Radian Aerospace has plans to test its Radian One space plane over the next few years.
• Radian's model differs from multi-stage rockets and could be a cheap alternative to space travel.

One company is reviving a decades-old NASA idea to build a reusable space plane that could shuttle people and small payloads to space for cheap.