Could aliens ever visit Earth? An aerospace scientist unpacks the challenges of interstellar spaceflight
Read More 4 minute read Math and the Sciences Space What’s the shape of the universe? Mathematicians use topology to study the shape of the world and everything in it You can describe the shape you live on in multiple dimensions. vkulieva/iStock via Getty Images Plus John Etnyre,… byJohn EtnyreMarch 9, 2025