Photographers use tools called flags to block and control light. NASA has detailed a new technology called a starshade that’s essentially a gigantic flag in space for doing photo shoots with space telescopes. “Although starshades have never flown in space, they hold the potential to enable groundbreaking observations of planets beyond our solar system, including pictures of planets as small as Earth,” NASA writes. A starshade mission would involve two spacecraft working together with extreme precision. One would be a…