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Arcturus Trivia Questions

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

1.

Arcturus is one of the closest stars to Earth, at just 4.3 light-years away.

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Easy
✗ FALSE

It's about 37 light-years away. The closest is Proxima Centauri at 4.2 ly; Arcturus is bright because of its size, not proximity.

2.

The name Arcturus comes from Greek meaning 'guardian of the bear' because it follows Ursa Major.

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Easy
✓ TRUE

From 'arktos' (bear) and 'ouros' (guardian); in mythology, it's the bear-watcher, following the Big Bear (Ursa Major) across the sky.

3.

Arcturus is a red supergiant star nearing the end of its life and will soon go supernova.

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Medium
✗ FALSE

It's an orange giant, not a supergiant; it's in a late stage but lacks mass for a supernova—it will become a white dwarf instead.

4.

Arcturus is the brightest star visible from Earth's Northern Hemisphere after Sirius.

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Medium
✓ TRUE

It's the fourth-brightest overall, but second in the north, outshone only by Sirius (which is visible in both hemispheres).

5.

Arcturus was used to open the 1933 Chicago World's Fair via a photoelectric cell triggered by its light.

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Medium
✓ TRUE

Starlight from Arcturus, focused by a telescope, activated a photocell to turn on the fair's lights, timed for its 40-year journey.

6.

Arcturus is actually a binary star system with a faint red dwarf companion.

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Hard
✓ TRUE

It has a known companion, Arcturus B, a red dwarf about 2.5 arcseconds away, discovered in the 19th century.

7.

Arcturus has a confirmed exoplanet roughly the size of Jupiter in a close orbit.

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Hard
✗ FALSE

No planets have been confirmed around Arcturus despite searches; its variability and age make planet detection tricky.

8.

Arcturus is moving so fast through the Milky Way that it will eventually leave our galaxy.

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Hard
✗ FALSE

It's a high-velocity star with odd orbit, but it's bound to the Milky Way and won't escape; it's just passing through the disk.

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