Debunking the “space skydive” myth. Why do astronauts float weightlessly on the International Space Station, whereas airplane passengers walk as if they are on solid ground? Understanding the difference between aerodynamic lift and orbital motion

What if the 3D world you see is just your brain’s best guess? The Schroeder stairs illusion reveals how flat retinal images become the 3D reality we perceive as our surroundings

Mercury would burn us and Venus would crush us; only Mars offers conditions that, though challenging, could support long-term human settlement.