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Astronomy Timeline

Ethan Kyer

Created on March 2, 2026

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Transcript

Breif Astronomy Timeline

The Big Bang theory, originating in the 1920s, posits that the universe expanded from an extremely hot, dense state roughly 13.8 billion years ago. Proposed by Georges Lemaître in 1927 and bolstered by Edwin Hubble's 1929 observation of galactic expansion,

Heliocentrism is the astronomical model placing the Sun at the center of the solar system, with Earth and other planets orbiting it. Formally proposed by Nicolaus Copernicus in 1543. Solidified later by Johannes Kepler and Galileo Galilei.

Geocentrism is a superseded cosmological model placing a stationary Earth at the center of the universe, with the Sun, Moon, planets, and stars orbiting it

Sir Isaac Newton (1642–1727) was an English mathematician and physicist who revolutionized science by developing the theory of gravity, the laws of motion (published in Principia in 1687), and calculus.

The gravitational constant was first measured in 1798 by Henry Cavendish using a sensitive torsion balance to "weigh the Earth."

Gravitational Constannt

Big bang

Heliocentrism

Gravity

Geocentrism

1927-29

1798

15-1800

380 B.C.

1687