Question

is the following statement true or false:
\when factoring in look-back time, the milky way galaxy is currently quiescent.\
true
false
question 16
1 pts
while studying an active galaxy, you discover that near the center its luminosity is more than 10,000,000 higher than our suns luminosity. moreover, you discover that the luminosity triples in value over the period of one year. what can be concluded this active galaxy?
the galaxy possess giant lobes of gas producing producing large amounts of radio waves.
the host galaxy is elliptical in morphology but smaller than the milky way galaxy.
all of the stars within the host galaxy triple in luminosity within one year.
the object near the center has a diameter of one light year.
question 17
1 pts
is the following statement true or false:
\all active galaxies are young galaxies due to the activity within their nucleus.\
true
false

Explanation:

Look-back time accounts for the delay in light travel, but the Milky Way's current state (from our frame) is quiescent—its central supermassive black hole has little accretion activity now.

The rapid luminosity variation (tripling in 1 year) implies the emitting region's size is ≤ light-year (light travels 1 light-year in 1 year; variations can't be faster than light crossing the source). Other options lack evidence: radio lobes aren't indicated, host galaxy morphology/size isn't supported, and stars can't triple luminosity in a year.

Active galaxies' nuclear activity stems from supermassive black hole accretion, not age. Old galaxies can become active (e.g., via galaxy mergers triggering accretion), so not all active galaxies are young.

Answer:

True