It’s been fodder for sci-fi stories for years, but realistically, it’s only a matter of time. It could be a few decades, it could be a few thousand years, but Earth is eventually going to get hit where it hurts by an asteroid.
Elon Musk recently rolled out an ambitious plan for how SpaceX will hopefully lead the charge to colonize Mars, and one component of that plan was fueling and refueling ships in space. It cuts down on costs (since the object isn’t as heavy at launch), and could make reusable space tech even easier to use. But NASA has a few concerns with the company’s first step toward that vision.