Astronomy Quiz 1
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Astronomy quiz 1
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35 Terms
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Ptolemy
Proposed the Geocentric Model, suggesting that the Earth is at the center of the universe.
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Geocentric Model
A model of the universe where Earth is at the center.
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Copernicus
Suggested the Heliocentric Model, stating that the Sun is at the center of the solar system.
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Heliocentric Model
A model of the solar system where the Sun is at the center.
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Galileo Galilei
Used telescopes to observe celestial objects and supported the Heliocentric theory.
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Tycho Brahe
Known for making detailed planetary observations.
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Johannes Kepler
Formulated the Laws of Planetary Motion.
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Isaac Newton
Developed the Law of Universal Gravitation.
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Refracting Telescopes
Telescopes that use lenses to gather and focus light.
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Reflecting Telescopes
Telescopes that use mirrors to gather and focus light.
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Radio Telescopes
Telescopes that detect radio waves from space.
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Space Telescopes
Telescopes that operate outside Earth’s atmosphere.
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Aperture
The diameter of the primary lens or mirror, affecting light-gathering power.
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Magnification
The enlargement of an image.
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Celestial Sphere
An imaginary sphere surrounding Earth where celestial objects appear.
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Zenith
The point directly overhead for an observer.
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Horizon
Where the sky meets the Earth.
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Celestial Equator
The projection of Earth's equator onto the celestial sphere.
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Ecliptic
The path of the Sun across the celestial sphere throughout the year.
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Meridian
A line running from North to South through the zenith.
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North Celestial Pole
A point in the sky near Polaris, the North Star.
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South Celestial Pole
The point directly opposite the North Celestial Pole.
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Right Ascension (RA)
Similar to longitude on Earth, measured in hours along the celestial equator.
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Declination (Dec)
Similar to latitude on Earth, measured in degrees north or south of the celestial equator.
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Circumpolar Stars
Stars that never set and move around the celestial pole.
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Parallax
An apparent shift in a star's position due to Earth's movement, used to measure distances.
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Circumpolar Constellations
Constellations that are always visible in the night sky.
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Seasonal Constellations
Constellations that are only visible during certain seasons.
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Zodiac Constellations
Constellations that lie along the ecliptic path.
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Orion
A constellation visible in winter, containing bright stars Betelgeuse and Rigel.
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Ursa Major
A constellation that contains the Big Dipper, used to find Polaris.
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Cassiopeia
A W-shaped constellation near the North Celestial Pole.
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How does RA help locate celestial objects?
RA measures East-West position, similar to longitude on Earth.
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How does Dec help locate celestial objects?
Dec measures North-South position, similar to latitude on Earth.
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Why do constellations shift throughout the year?
Constellations appear to shift due to Earth's revolution around the Sun.
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