Just move a vector parallel to itself around a circle. If you end up with the same vector you started with space is flat, if not, it's curved.

What is it? "This is what lightning looks like from the top down," wrote Anne McClain, a NASA astronauts and Expedition 73 crew member, from aboard the International Space Station, in May 2025.

By Dean Murray. An astronaut has captured jaw-dropping lightning from space. NASA's Nichole Ayers has wowed space fans with her snaps of the atmospheric activity on Friday, May 2.

Space company Vector and blockchain developer Nexus announced a partnership to host Nexus’s decentralized cryptocurrency on a satellite orbiting the Earth, using Vector’s GalacticSky platform..

What is it? "This is what lightning looks like from the top down," wrote Anne McClain, a NASA astronauts and Expedition 73 crew member, from aboard the International Space Station, in May 2025.