Question

2 how is distance communicated to earth from unmanned spacecraft? luminosity radio waves parallax skip 1/10 complete

Explanation:

Unmanned spacecraft use radio waves to communicate with Earth. Radio waves can travel long - distances through space and are used for transmitting various types of data including distance information. Luminosity is related to the brightness of an object and not a method for distance communication. Parallax is a method for measuring distance on Earth or in space but not a way to communicate distance back to Earth from a spacecraft.

Answer:

B. Radio waves