Q15. The space observatory Gaia was launched in 2013 as the successor toHipparcos and is returning data on its ambitious mission to catalog the 3-dimensional position of more than 1 billion stars in the Milky Way. Thesmallest parallax angle it can measure, for stars of at least magnitude 12, is0.000008", What is the most distant star to which Gaia can measure parallax?Q16. The center of our Galaxy is about 8,500 parsecs from Earth.a. What would be the parallax angle of a star near the center of theGalaxy?b. Could this angle be measured by Hipparcos?c. Could this angle be measured by Gaia?

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