Question

Neptune is approximately 4.5 billion kilometers from the sun. What is this distance in AU?

Answer 1

Below are the choices that can be found from other source:

a. 0.3 AU 
b. 3.8 AU 
c. 30 AU 
d. 3 million AU 

Answer is c. 30 AU. 

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Answer 2

Answer:

Neptune is 30.08 AU from the sun

Explanation:

It is given that, Neptune is approximately 4.5 billion kilometers from the sun. We know that,

1 billion km = 10⁹ km

Astronomical unit is the unit to measure distance from earth to sun. It is equal to :

$1\ AU=1.496\times 10^8\ km$

4.5 billion km means, $4.5\times 10^9\ km=45\times 10^8\ km$

So, $45\times 10^8\ km=\dfrac{45\times 10^8}{1.496\times 10^8}=30.08\ AU$

Hence, 4.5 billion km equals 30.08 AU.