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What is NGC 6543?

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NGC 6543, also known as the Cat's Eye Nebula, is a planetary nebula located in the constellation Draco. It is known for its complex structure and bright central star.

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What is GW150914?

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GW150914 is the first detected gravitational wave event, observed by LIGO in 2015. It was caused by the merger of two black holes.

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What is Sirius?

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Sirius, also known as the Dog Star, is the brightest star in the night sky. It is part of the constellation Canis Major and is often studied in various wavelengths, including X-ray.

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What is Cassiopeia A?

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Cassiopeia A (Cas A) is a supernova remnant in the constellation Cassiopeia. It is one of the strongest radio sources in the sky and is studied to understand stellar explosions.

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What is the Hulse-Taylor Pulsar?

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The Hulse-Taylor Pulsar is a binary pulsar system discovered in 1974. It provided the first indirect evidence of gravitational waves and is important for testing theories of gravity.

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What is a planetary nebula?

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A planetary nebula is an astronomical object formed from the outer layers of a star that has shed its material at the end of its life cycle, often creating a glowing shell of ionized gas.

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What are gravitational waves?

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Gravitational waves are ripples in spacetime caused by the acceleration of massive objects, such as merging black holes or neutron stars.

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What is a supernova?

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A supernova is a powerful and luminous explosion that occurs at the end of a star's life cycle, resulting in the star's dramatic increase in brightness.

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What is a black hole?

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A black hole is a region of spacetime where gravity is so strong that nothing, not even light, can escape from it. They are formed from the remnants of massive stars.

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What is the significance of the Dog Star?

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Sirius, the Dog Star, is significant in astronomy for its brightness and proximity to Earth. It has been used for navigation and is part of various cultural mythologies.