Question

1. A light year is defined as the distance light travels in one year. A galaxy is about 150,000 light years wide. About how many kilometers wide is a galaxy if 1 light year is given below? * 9.46x10^{12}

Answer 1

Answer: 1.419 * 10¹⁸ km

Explanation:

The galaxy in question is 150,000 light years wide.

If 1 km = 9.46 * 10¹² then the width of this galaxy in kilometers is:

= Distance in light years * Conversion factor of light years to kilometers

= 150,000 * 9.46 * 10¹²

= 1,419,000 * 10¹² km

= 1.419 * 10¹⁸ km