The Milky Way galaxy

Chapter 1

Mapping our cosmic neighborhood

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Chapter 2

The monster at the center

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Chapter 3

The Milky Way in human culture

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Chapter 4

The fate of our galactic home

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YOUR GOAL

Master of The Milky Way galaxy

Ch 2 · The monster at the center

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teacher Capturing the first direct image

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Fun Fact

Black hole mass: Sagittarius A* has a mass equal to about 4 million Suns, yet its physical diameter is smaller than the orbit of Mercury.

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teacher How stars dance around a ghost

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Glossary

black hole (noun)
A region of space having a gravitational field so intense that no matter or radiation can escape. In 2022, the Event Horizon Telescope captured the first direct image of Sagittarius A.

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Quiz

What is the name of the star used by astronomers to prove the existence of Sagittarius A* by tracking its rapid 16-year orbit?

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Gossip

Would you visit a black hole if safety was guaranteed?

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Quiz

How did astronomers first detect Sagittarius A* before taking its picture?

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Quiz

What type of electromagnetic radiation is best suited to pierce the dust clouds blocking the galactic center?

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Quiz

Why can't we see the center of the Milky Way with our naked eyes?

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Quiz

What color was the glowing ring of gas in the famous 2022 image of Sagittarius A*?

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Quiz

Which international collaboration captured the first image of Sagittarius A* in 2022?

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Quiz

How many times more massive than our Sun is the black hole Sagittarius A*?

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Quiz

What is the name of the supermassive black hole at the center of the Milky Way?

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