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Discovery of the first atmosphere on an exoplanet (HD 209458 b).

Ole Rømer's determination of the speed of light using observations of Jupiter's moons.

Discovery of Pluto by Clyde Tombaugh, now classified as a dwarf planet.

The measurement of the Earth's circumference by Eratosthenes.

The prediction and subsequent discovery of Neptune by Johann Galle, based on mathematical calculations by Urbain Le Verrier and John Couch Adams.

Discovery of Uranus by William Herschel, the first new planet discovered since ancient times.

The discovery of the Higgs boson, validating the final undiscovered part of the Standard Model of particle physics.

Discovery of a network of salty subglacial lakes on Mars by the Mars Express orbiter.

Johannes Kepler's laws of planetary motion, defining the elliptical orbits of planets.

Edwin Hubble's observation of the expanding universe, leading to the formulation of Hubble's Law.

The detection of the first gravitational waves, confirming a prediction of Einstein's general theory of relativity.

The first image of a black hole's event horizon in the galaxy M87 by the Event Horizon Telescope.

Evidence for the accelerating expansion of the universe from observations of Type Ia supernovae.

Discovery of Sedna, a dwarf planet in the outer reaches of the Solar System.

Identification of Eris, a dwarf planet larger than Pluto, leading to questions about the definition of a planet.

The discovery of Proxima Centauri b, an exoplanet in the habitable zone of the closest star to the Sun, Proxima Centauri.

The detection of phosphine in Venus' atmosphere by researchers using the James Clerk Maxwell Telescope and ALMA.

The discovery of the first planets beyond our solar system (exoplanets) around the pulsar PSR B1257+12.

Direct imaging of an exoplanetary system around the star Fomalhaut.

Observation of the merging of neutron stars via both gravitational waves and electromagnetic waves (a multi-messenger observation).

Discovery of the Cosmic Microwave Background Radiation by Arno Penzias and Robert Wilson, providing evidence for the Big Bang Theory.

Discovery of the first pulsar (PSR B1919+21) by Jocelyn Bell Burnell and Antony Hewish.

Discovery of the rings of Uranus, about six years before the Voyager 2 spacecraft flyby.

Discovery of 51 Pegasi b, the first exoplanet orbiting a sun-like star.