Galaxy types, the Big Bang, dark matter, and other cosmology facts.
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- What are the three main morphological types of galaxies?
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Spiral, elliptical, and irregular.- What is a spiral galaxy?
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A galaxy with a flat rotating disk and spiral arms extending from the center.- What is an elliptical galaxy?
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A galaxy shaped like an ellipse, ranging from nearly spherical to very elongated.- What is an irregular galaxy?
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A galaxy with no distinct shape, often distorted by gravitational forces from nearby galaxies.- What is a barred spiral galaxy?
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A spiral galaxy with a bar-shaped structure of stars across its center.- What is the Big Bang?
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The leading theory that the universe expanded from an extremely hot, dense initial state.- How old is the universe according to current estimates?
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Approximately 13.8 billion years.- What is cosmic expansion?
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The continuous increase in distance between galaxies over time.- What is dark matter?
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Invisible matter comprising about 85% of the matter in the universe, detected only through gravitational effects.- What is dark energy?
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A mysterious form of energy causing the acceleration of cosmic expansion.- What is the observable universe?
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The spherical region of the universe we can potentially observe, limited by the distance light has traveled since the Big Bang.- What is redshift?
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The increase in wavelength of light from objects moving away from us.- What is the Milky Way?
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Our galaxy, a large spiral galaxy containing hundreds of billions of stars.- How far away is the Andromeda Galaxy from the Milky Way?
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Approximately 2.5 million light-years.- What is a light-year?
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The distance light travels through vacuum in one year.
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