What is the distance across our solar system in kilometers?
There is no exact border for solar system.It extends up to Oort's cloud.where Sun's gravity is effective..
Approximately it extends up to 10,0000 astronomical u nits/.
picture credit universetoday.com.
Much more than
The solar orbiter that reaches the farthest aphelion = 936 AU is
the dwarf planet Sedna. So, the solar system across should be wider
than 2(aphelion of Sedna) =
Yet, in my opinion, it should be as wide as nearly 4 light years = #3.8
X 10^13# km. This estimate comes from zero-gravity edge as
midway between the Sun and the nearest star Alpha Centauri at
4.246 light years from the Earth..