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A knowledge platform for everything above Earth — astronomy, space, the night sky, celestial events, mythology, and astrology as a clearly separate cultural tradition.

Astronomy is presented as scientific, evidence-based, and sourced. Astrology is presented as cultural, symbolic, and interpretive — never as proven science.

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Home
History of Astronomy
Scientific Discoveries

Discover

Scientific Discoveries

The great discoveries in the history of astronomy, in chronological order.

22 entries.

Discovery
Precession of the Equinoxes
c. 130 BCE
Discovery
The Galilean Moons of Jupiter
1610 CE
Discovery
The Phases of Venus
1610 CE
Discovery
The Discovery of Titan
1655 CE
Discovery
The Nature of Saturn's Rings
1659 CE
Discovery
The Periodicity of Halley's Comet
1705 CE
Discovery
The Discovery of Uranus
1781 CE
Discovery
The Prediction and Discovery of Neptune
1846 CE
Discovery
The Cepheid Period–Luminosity Relation
1912 CE
Discovery
What Stars Are Made Of
1925 CE
Discovery
The Expansion of the Universe
1929 CE
Discovery
Evidence for Dark Matter
1933 CE
Discovery
The Discovery of Quasars
1963 CE
Discovery
The Cosmic Microwave Background
1965 CE
Discovery
The Discovery of Pulsars
1967 CE
Discovery
The First Kuiper Belt Object
1992 CE
Discovery
The First Exoplanet Around a Sun-like Star
1995 CE
Discovery
The Accelerating Universe
1998 CE
Discovery
The First Detection of Gravitational Waves
2015 CE
Discovery
The First Image of a Black Hole
2019 CE
Discovery
The Milky Way's Central Black Hole
c. 2020 CE
Discovery
JWST's First Science Images
2022 CE