How far away, in kilometres, is Sirius from the sun?

Question

The distance from our sun to Sirius, the brightest star of the night sky, is 8.6 light years. A light year is the distance that light travels in one year (365 days).

Answer 1

Speed of light = 3x10⁸ m/s

3x10⁸ m/s x 60 s / min x 60 min / hr x 24 hr / day = 2.59x10¹³ m / day

2.59x10¹³ m / day x 365 day / yr = 9.46x10¹⁵ m / year = 1 light year

9.46x10¹⁵ m / year / light year x 8.6 light years = 8.14x10¹⁶ m

8.14x10¹⁶ m x 1 km / 1000 m = 8.14x10¹³ km

(this is about 50,000,000,000 miles)