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Whirlpool Galaxy Trivia Questions

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

1.

You can easily see the Whirlpool Galaxy with the naked eye from a dark site.

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Easy
✗ FALSE

M51 is too faint for the naked eye; even with binoculars it appears as a faint smudge, requiring a small telescope to see its spiral arms.

2.

The Whirlpool Galaxy's spiral arms are named after the famous composer Johann Strauss.

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Easy
✗ FALSE

The Whirlpool's arms are not named after Strauss; they are simply designated by astronomers as major and minor spiral features.

3.

The Whirlpool Galaxy is colliding with a smaller dwarf galaxy.

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Medium
✓ TRUE

M51 is gravitationally interacting with NGC 5195, a dwarf galaxy, causing its distinctive spiral arms to be stretched and distorted.

4.

The Whirlpool Galaxy is located about 23 million light-years from Earth.

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Medium
✓ TRUE

The Whirlpool Galaxy (M51) is approximately 23 million light-years from Earth, located in the constellation Canes Venatici.

5.

The Whirlpool Galaxy was the first ever identified as a spiral nebula.

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Hard
✓ TRUE

In 1845, Lord Rosse observed M51 with his Leviathan telescope and first recognized its spiral structure, classifying it as a spiral nebula.

6.

The Whirlpool Galaxy is thought to be older than the Milky Way.

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Hard
✗ FALSE

The Whirlpool Galaxy is not older; the Milky Way formed about 13.6 billion years ago. The Whirlpool's current spiral structure is only about 400 million years old, but its stars are ancient.

7.

The Whirlpool Galaxy has a supermassive black hole at its center.

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Hard
✓ TRUE

M51 is a Seyfert 2 galaxy with an active nucleus, indicating a supermassive black hole. Observations estimate its mass at about 10^6 solar masses.

8.

Its companion galaxy, NGC 5195, is passing behind the Whirlpool, not in front.

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Hard
✓ TRUE

Observations show NGC 5195 is currently behind M51 from our perspective, having passed through the disk about 50 million years ago.

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