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 Earth?

Proxima Centauri
Arcturus
Sirius
Betelgeuse

The correct answer is: Proxima Centauri

Proxima Centauri is the closest star to Earth. It is a red dwarf star located in the Alpha Centauri star system, which is the closest star system to our own solar system. It is about 4.2 light years away from Earth, making it the closest star to us. Option B, Arcturus, is actually much further away from Earth at a distance of 36.7 light years. Option C, Sirius, is also not correct as it is the brightest star in our night sky, but it is still much further away than Proxima Centauri at a distance of 8.6 light years. Option D, Betelgeuse, is a well-known star in the Orion constellation, but it is not the closest star to Earth and is approximately 642.5 light years away.