Question: Which observatory/satellite was launched into space first, Hakucho or Chandra X-ray Observatory?
Sentence (from "X-ray Astronomy Recovery Mission"): The X-ray Astronomy Recovery Mission (XARM, pronounced "charm") is an X-ray astronomy satellite project of the Japan Aerospace Exploration Agency (JAXA) to provide breakthroughs in the study of structure formation of the universe, outflows from galaxy nuclei, and dark matter.
Relevant evidence: No