They're asking you to fill in the distance from the sun to the planet in kilometers.
Mercury is 57,900,000 kilometers from the sun.
Venus is 107,477,000 km from the sun at its closet point.
Earth is the third planet closest to the sun, and at it's closest point is about 146,000,000 km away.
Mars, at its closest point to the sun, is 206,000,000 km away.
Jupiter's average distance from the sun is 779,000,000 km.
Saturn's average distance from the sun is 1.4 billion km.
Uranus' average distance from the sun is 2.88 billion km.
Lastly Neptune's average distance from the sun is 4.5 billion km.
I hope this is what you're looking for
