An AGN is observed to double in brightness over 8.6 days and then to grow dim...

Question

Question

$For the majority of galaxies astronomers observe, the light travel time is less than a billion years. This is only a fraction$

Answer 1

Answer #1

(First answer)

Calculate the diameter aboout 1200 AU or roughly 10 times the diameter of the system.

Diameter < (c* Δt) ................ (1)

Calculate the value of Δt ,

Δt = (8.6 days)(24 h/day)(3600 s/h)

= 743040 s

Use equation (1)

Diameter < (3*10^5 km/s)( 743040 s )

= 2.23*10^11 km

= ( 2.23*10^11 km )(1 AU/1.496*10^8)

= 1490.05 AU

Answer 2

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