Question

the doppler effect is used to measure the speed of galaxies. *
true
false

what does it mean that the sagittariusdwarf is being absorbed? *
it is spiraling toward the clouds of magellan
it is becoming a black hole
it is colliding with the virgo cluster
it is becoming part of the milky way galaxy.

Explanation:

First Question:

The Doppler Effect (specifically redshift/blueshift in light) is used to measure the radial velocity of galaxies by analyzing the shift in spectral lines. So the statement is true.

The Sagittarius Dwarf Galaxy is on a trajectory to be merged (absorbed) into the Milky Way Galaxy over time, becoming part of it. The other options are incorrect: it's not moving toward the Magellanic Clouds, becoming a black hole, or colliding with the Virgo Cluster.

Answer:

True

Second Question: