# 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..

#### Explanation:

Approximately it extends up to 10,0000 astronomical u nits/.
picture credit universetoday.com.

Jul 11, 2016

Much more than $2 X a p h e l i o n = 2.8 X {10}^{11} k m$. of dwarf planet Sedna.

#### Explanation:

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) = $2.8 X {10}^{11} k m$.

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..

$1 A U = 1495987871 k m \mathmr{and}$

$1 l i g h t y e a r = 299792 X 3600 X 24 X 365.25 k m =$9.46 X 10 ^ 12 km.