Many of the sounds have an emphasis on scientific studies and were created by both data and actual audio collected from radio, infrared, and x-ray telescopes, low and high frequency radio receivers, and from sensors built into Mars rovers, probes and space labs.
Additionally, there are sounds from historical manned and unmanned space missions with communications by astronauts, mission control centers, and other personnel as well as recordings of equipment used in these missions.
Listen to many very interesting yet sometimes strange, unusual and spooky sounds from black holes, pulsars, stars, planets, moons, comets, meteors, space travel, and interstellar space.
You will love this app.