Topic 3: Deep Space Astronomy

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What is the Milky Way Galaxy?

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The Milky Way Galaxy is the galaxy that contains our solar system, along with billions of other stars.

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What is the primary fuel of the Sun?

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The primary fuel of the Sun is hydrogen, which undergoes nuclear fusion to produce energy.

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What is a galaxy?

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A galaxy is a massive system that consists of stars, stellar remnants, interstellar gas, dust, and dark matter, bound together by gravity.

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What does a redshift in a star's spectral lines indicate?

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A redshift indicates that the star is moving away from us, and the greater the shift, the faster it is moving away.

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What are spiral galaxies?

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Spiral galaxies are a type of galaxy characterized by spiral arms that wind outward from the center.

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What is a comet?

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A comet is a small celestial body made of ice, dust, and rocky material that, when passing close to the Sun, develops a glowing coma and tail.

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What is an asteroid?

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An asteroid is a small rocky body that orbits the Sun, primarily found in the asteroid belt between Mars and Jupiter.

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What is the difference between a star and a planet?

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A star is a luminous celestial body that generates energy through nuclear fusion, while a planet is a celestial body that orbits a star and does not produce its own light.

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What is the significance of the Doppler effect in astronomy?

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The Doppler effect helps astronomers determine the motion of stars and galaxies by observing the shift in the frequency of light they emit.

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What is the role of dark matter in the universe?

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Dark matter is a form of matter that does not emit light or energy, and it is believed to make up a significant portion of the universe's total mass, influencing the gravitational forces within galaxies.