Untitled Flashcard Set

Astronomy

Study of celestial objects and space.

Constellation

Pattern of stars seen from Earth.

Geocentric

Earth-centered model of the universe.

Heliocentric

Sun-centered model of the universe.

Ellipse

Oval-shaped orbit around a celestial body.

Relativity

Einstein's theory of space, time, and gravity.

Expanding Universe

Concept that galaxies are moving away from one another.

Ancient Civilizations

Early societies that studied celestial bodies for agriculture, timekeeping, and navigation.

Seasonal Tracking

Using celestial observations to identify seasons for planting and harvesting.

Famous Constellations

Includes Ursa Major, Ursa Minor, Cassiopeia, Draco, and Orion.

Aristotle

Proposed the geocentric model with the Earth at the universe's center.

Aristarchus of Samos

Proposed the heliocentric model with the Sun at the center.

Ptolemy

Refined the geocentric model.

Copernicus

Revived the heliocentric model in modern astronomy.

Galileo Galilei

Used telescopes to gather evidence supporting heliocentrism.

Tycho Brahe

Made precise observations of planetary positions.

Johannes Kepler

Developed the three laws of planetary motion; showed elliptical orbits.

Isaac Newton

Explained planetary motion using gravity and developed the laws of motion.

Albert Einstein

Improved understanding of gravity, space, and time with the theory of relativity.

Henrietta Swan Leavitt

Developed a method for measuring cosmic distances using Cepheid variable stars.

Edwin Hubble

Measured distances to galaxies and showed the universe is expanding.