The instrument astronomers are now using to make the most precise measurements of stellar parallax we have ever had is
A) the 5-meter (Hale) reflector on Mt. Palomar
B) the Very Large Array of radio telescopes
C) the Compton Gamma Ray Observatory
D) the Gaia satellite in space
E) a swimming-pool sized vat of cleaning fluid deep in the shaft of a gold mine

Question

Quizplus · Accepted Answer

The Gaia satellite is specifically designed and equipped to make precise measurements of stellar positions and parallaxes, among other data. It uses astrometry to measure the positions and motions of stars with unprecedented accuracy, allowing for precise measurements of their parallax and distance from Earth. The other options listed are not designed for this purpose.

The Instrument Astronomers Are Now Using to Make the Most