Question

scientists have detected an asteroid that is 700,000,000 km from earth. about how many astronomical units is that?
0.5 au
1 au
3.5 au
4.5 au

Explanation:

Step1: Recall 1 AU definition

1 astronomical unit (AU) = $1.5\times10^8$ km, or 150,000,000 km

Step2: Calculate AU value

Divide distance by 1 AU: $\frac{700,000,000}{150,000,000} \approx 4.67$

Step3: Match to closest option

The value is closest to 4.5 AU

Answer:

4.5 AU