World Science Scholars
3.2 Finding the Monster
  • There’s a thin layer of sodium atoms 90 km up in the atmosphere.
  • Using lasers to create an artificial star in this layer of sodium atoms, Professor Ghez can calculate how to adjust the deformable mirror.
  • The star is S0-2 orbits closest to the supermassive black hole at the center of the Milky Way. Studying S0-2 helps understand the curvature of spacetime.
  • Using S0-2, Ghez was able to show that the 4E6 solar masses located at Sagittarius A* are in fact a supermassive black hole.

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