7. Light travels at approximately \( 3 \times 10^{5} \) kilometers per second. There are \( 6 \times 10^{5} \) seconds in one week. About how many kilometers ches light travel in one week? \( \begin{array}{ll}\text { (A) } 1.8 \times 10^{9} & \text { Yon must show vour work to receive full credit } \\ \text { (a) } 2 \times 1.8 \times 10^{11} & \text { (D) } 2 \times 10^{0}\end{array} \)

To find out how many kilometers light travels in one week, you can simply multiply its speed by the number of seconds in a week. Here’s the math: Speed of light = \( 3 \times 10^{5} \) km/s Seconds in a week = \( 6 \times 10^{5} \) s So, the total distance traveled in one week = \( 3 \times 10^{5} \times 6 \times 10^{5} \) km, which simplifies to \( 18 \times 10^{10} \) km, or \( 1.8 \times 10^{11} \) km. The closest answer is (B) \( 1.8 \times 10^{11} \). Now, let’s add a sprinkle of fun and knowledge! Did you know that light from the Sun takes about 8 minutes and 20 seconds to reach Earth? This means the sunlight we bask in is over 8 minutes old! That’s a significant delay in cosmic terms, but at \( 300,000 \) kilometers per second, it’s still a pretty speedy delivery service! For true light enthusiasts, you might want to explore Einstein's theory of relativity, which fundamentally changed our understanding of time and space. It connects the incredible speed of light with the very fabric of the universe, illustrating why nothing can travel faster than light—truly mind-boggling stuff! Grab a good book, and let your imagination soar through the cosmos!