Our best stellar parallax measurements to date come from
A) the Hipparcos satellite.
B) radio interferometry.
C) ground based measurements taken six months apart.
D) observations made by astronauts.
E) the Keck telescope.

Question

Quizplus · Accepted Answer

The Hipparcos satellite, launched by the European Space Agency (ESA) in 1989, was specifically designed for measuring the positions, distances, and proper motions of stars with unprecedented precision, making it a significant source of the best stellar parallax measurements to date.

Our Best Stellar Parallax Measurements to Date Come from