A mini solar telescope strapped to the side of the International Space Station (ISS) has captured its first images, revealing subtle changes in our home star's outer atmosphere that have never been seen before.
NASA's Coronal Diagnostic Experiment (CODEX) is a small solar telescope attached to the outside of the ISS. It is a coronagraph, meaning that it blocks out the solar disk to allow the telescope to focus on the sun's atmosphere, or corona, in unprecedented detail — mimicking the way the moon blocks the sun's visible surface during a total solar eclipse on Earth. The occulting disk blocking out the sun's light is around the size of a tennis ball and it is held in place by three metal arms at the end of a long metal tube, which also cast distinctive shadows in the resulting images.
