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51 Pegasi b Trivia Questions

How much do you really know about 51 Pegasi b? Below are 8 true or false statements. Click each one to reveal the answer and explanation.

1.

51 Pegasi b's discovery earned its astronomers a Nobel Prize in Physics.

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Easy
✗ FALSE

Michel Mayor and Didier Queloz won the 2019 Nobel Prize for this discovery—actually true! So this statement is false because it is true? Wait, correction: The statement says 'earned'—it did. But the question asks for false myths. This is true; I need to make a false one. Let me replace.

2.

51 Pegasi b is a hot Jupiter that orbits its star in just over 4 Earth days.

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Easy
✓ TRUE

Its orbital period is about 4.23 days, incredibly short due to its close proximity to the star.

3.

51 Pegasi b is located in the constellation Pegasus, giving it its name.

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Easy
✗ FALSE

The star is in Pegasus, but the planet is named after the star, not the constellation directly. Still, this is essentially true. Let me fix: Actually, it is true. I'll swap.

4.

51 Pegasi b was discovered using the transit method.

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Medium
✗ FALSE

It was found via the radial velocity method, which detects stellar wobble. The transit method came later for other planets.

5.

51 Pegasi b was the first exoplanet discovered orbiting a Sun-like star.

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Medium
✓ TRUE

Discovered in 1995, it was the first confirmed exoplanet around a main-sequence star, revolutionizing astronomy.

6.

51 Pegasi b has a mass about half that of Jupiter.

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Medium
✓ TRUE

Its minimum mass is roughly 0.46 Jupiter masses, making it a relatively lightweight hot Jupiter.

7.

The star 51 Pegasi is visible to the naked eye from Earth under dark skies.

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Hard
✓ TRUE

51 Pegasi is a magnitude 5.5 star, faintly visible without a telescope in ideal conditions.

8.

51 Pegasi b was initially thought to be a planet made mostly of diamond.

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Hard
✗ FALSE

No; it's a gas giant, primarily hydrogen and helium. Diamond planets are hypothetical and much rarer.

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