Natural Science CLEP Prep Practice Exam

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Prepare for the Natural Science CLEP Exam with comprehensive quizzes and multiple choice questions. Each question includes hints and explanations to help you succeed. Ace your exam!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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What is the closest star to the Earth?

Alpha Centauri
Polaris
Proxima Centauri
Sirius

The correct answer is: Proxima Centauri

Proxima Centauri is actually the closest star to the Earth, as it is only 4.2 light years away. Alpha Centauri is the closest star system, but it is slightly farther away at 4.3 light years. Polaris is known as the North Star and is relatively close at about 433 light years away, but it is not the closest. Sirius, while one of the brightest stars in the night sky, is actually about 8.6 light years away from Earth. Therefore, Proxima Centauri is the closest star, with Alpha Centauri being a close second.