TIGERISS is a NASA Astrophysics Pioneers mission, envisioned for the International Space Station. On the International Space Station, the TIGER instrument family will soar to new heights. Without the interference from Earth's atmosphere, the TIGERISS experiment will make higher-resolution measurements and pick up heavy particles that wouldn't be possible from a scientific balloon. A perch on the space station will also allow for a larger physical experiment - 3.2 feet (1 meter) on a side - than could fit on a small satellite, increasing the potential size of the detector. And the experiment could last more than a year, compared to less than two months on a balloon flight. Researchers plan to be able to measure individual elements as heavy as lead, atomic number 82.