How many kilometers is 1 AU?

Prepare for the Pre-IB Grade 9 Science Exam with detailed flashcards and multiple-choice questions. Each question is paired with hints and thorough explanations. Ace your test with confidence!

Multiple Choice

How many kilometers is 1 AU?

Explanation:
1 AU is the average distance from the Earth to the Sun, about 150 million kilometers. In scientific notation, that’s roughly 1.5 × 10^8 km. This unit keeps solar-system distances manageable, since planets lie within a few tens of AU from the Sun. So the number that matches this distance is 1.5 × 10^8 km. The other options are off by large factors: 1.5 × 10^6 km is too small (about 1% of an AU), 1.0 × 10^9 km is several AU away, and 1.5 × 10^10 km would be about 100 AU.

1 AU is the average distance from the Earth to the Sun, about 150 million kilometers. In scientific notation, that’s roughly 1.5 × 10^8 km. This unit keeps solar-system distances manageable, since planets lie within a few tens of AU from the Sun. So the number that matches this distance is 1.5 × 10^8 km. The other options are off by large factors: 1.5 × 10^6 km is too small (about 1% of an AU), 1.0 × 10^9 km is several AU away, and 1.5 × 10^10 km would be about 100 AU.

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