Microlensing by a white dwarf star

• by Budgieye moderator

  During the close alignment, the white dwarf’s gravity bent the light
  from the distant star, making it appear offset by about 2
  milliarcseconds from its actual position.

  When we use SDSS have a difficult time seeing a change of 1 arc second. Hubble can detect 0.002 arc sec !

  https://www.nasa.gov/feature/goddard/2017/hubble-astronomers-develop-a-new-use-for-a-century-old-relativity-experiment

  Posted June 9, 2017 12:26 PM