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Blazar Trivia Questions

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

1.

Blazars are a type of active galactic nucleus with relativistic jets pointing directly at Earth.

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Easy
✓ TRUE

Blazars are indeed AGNs whose jets are aligned with our line of sight, making them appear extremely bright and variable.

2.

The term 'blazar' was coined after the discovery that BL Lacertae objects and quasars were the same thing.

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Medium
✓ TRUE

'Blazar' combines 'BL Lac' and 'quasar'—astronomers realized these were the same phenomenon viewed from different angles.

3.

Blazars emit most of their energy in radio waves, making them invisible in gamma rays.

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Medium
✗ FALSE

Blazars are actually among the brightest gamma-ray sources in the sky; their emission spans from radio to very high-energy gamma rays.

4.

Blazars can show dramatic brightness variations on timescales as short as a few minutes.

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Medium
✓ TRUE

Their compact emission regions and relativistic effects allow blazars to vary in brightness in minutes, a hallmark of these objects.

5.

The closest blazar to Earth is located in the Andromeda Galaxy, only 2.5 million light-years away.

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Hard
✗ FALSE

No confirmed blazar exists in Andromeda; the nearest known blazar, Markarian 421, is about 400 million light-years away.

6.

All blazars are powered by supermassive black holes with masses over a billion solar masses.

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Hard
✗ FALSE

While many have billion-solar-mass black holes, some blazars host black holes as low as tens of millions of solar masses.

7.

The first blazar ever discovered, 3C 273, was originally mistaken for a star in our galaxy.

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Hard
✓ TRUE

3C 273 was cataloged as a star in the 1880s but later identified as a distant quasar, and is now classified as a blazar.

8.

Blazars are rare because their jets must be aimed exactly at Earth, which happens only for about 1 in 10,000 AGNs.

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Hard
✗ FALSE

The alignment probability is actually about 1 in 100 to 1 in 1,000, depending on the jet opening angle; still rare but not that extreme.

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