From the introduction:
The crew of the Harmony, a spacecraft of the United Earth Expeditionary Mission, are on a mission to the Tarkovsky system for the purposes of research. On entering the system they made two discoveries in rapid succession. First, the star has rapidly destabilized and will go supernova very soon. Second, Tarkovsky 5 is inhabited and they have intercepted communications from the planet.
The intense solar activity is affecting the computer’s ability to provide accurate translations of the messages. There is an opportunity to communicate a limited number of questions in the allotted time for the purposes of evaluation. This will then determine the potential threats and benefits to human civilization and whether or not the crew should effect a rescue.