Astronomers Detect 10- Billion Year Old Multiplanet System

NASA's TESS mission (Transiting Exoplanet Survey Satellite) has discovered a system with three transiting exoplanets — including an ultra-short-period super Earth — around TOI-561, one of the oldest stars in our Milky Way Galaxy.

  • TOI-561 is a bright star located 280.5 light-years away in the constellation of Sextans.
  • The star is approximately 10 billion years old, and has a mass and size about 80% that of the Sun.
  • TOI-561 hosts at least three small transiting planets, named TOI-561b, c, and d, and is one of the oldest, most metal-poor planetary systems discovered yet in the Milky Way.

TOI-561b

  • Referred to as an ....
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