Question

What is the nearest equivalent of 10^20 m?

(a) 1.06 x 10^4 light years

(b) 2.54 x 10^5 light years

(c) 6.36 x 10^5 light years

(d) 3.87 x 10^6 light years

Answer 1

1 light years = $299 792 458\cdot31 557 600=9 460 730 472 580 800\ (m)$

$10^{20}/9 460 730 472 580 800=10570\ (light\ \ years)$

$(a)\ 1.06\cdot10^4\ (light years)$ . Answer