As for what's affordable... that's all in the eye of the beholder. The world has spent trillions of dollars on space launches already, with very little to show for it mass-wise. A low-g mass driver ...

"This is a structure we've never seen before, so it could be a new class of dark object." When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. A ...

The established wisdom seems to be that it's not something we can expect to see any time soon, let alone see receiving a budget allotment. However, there's a few compelling reasons I can think of: So ...