question: which of the following measurements show(s) that the universe is currently expanding? answer…

question: which of the following measurements show(s) that the universe is currently expanding? answer options: select one of four size of spiral galaxies gravitational microlensing blueshift relativistic doppler effect

question: which of the following measurements show(s) that the universe is currently expanding? answer options: select one of four size of spiral galaxies gravitational microlensing blueshift relativistic doppler effect

Answer

Brief Explanations:

The relativistic Doppler effect shows that light from distant galaxies is redshifted, indicating they are moving away from us, which is evidence of the universe's expansion. Blueshift would indicate objects moving towards us. The size of spiral galaxies and gravitational microlensing are not direct evidence of the universe's current - day expansion.

Answer:

Relativistic Doppler effect