The LISA spacecraft constellation. The triple spacecraft following Earth's orbit around the Sun. Credit: Simon Barke If someone told you NASA was building a giant space laser the size of the Sun, you'd probably wonder when the agency decided to go full "Star Wars" on everybody. Oh, and the European Space Agency (ESA) is in on it too, so I guess it's an international Death Star. Just kidding! But weirdly enough, not about the whole giant space laser the size of the Sun thing