Question

On the Hubble distance ladder, which technique is useful for determining the distance to an object located beyond 15 million parsecs away.
a) Radar
b) Hubble’s Law
c) Measuring the period of variable stars and applying the Period-Luminosity relationship.
d) Parallax

Answer 1

Answer:

d) Parallax

Explanation:

Astronomers use Hubble to measure the distances of a class of pulsating stars called Cepheid Variables, employing a basic tool of geometry called parallax.  This is the same technique used by surveyors to measure distances on Earth.

Answer 2

D is the answer for your question