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Discovery of Uranus by William Herschel, which expanded the known boundaries of our solar system and was the first planet found using a telescope, changing our understanding of the solar system.

The Apollo 11 mission successfully landed the first humans on the Moon, notably Neil Armstrong and Buzz Aldrin, marking a major milestone in space exploration.

The International Astronomical Union (IAU) redefines the classification of a planet, leading to the reclassification of Pluto as a dwarf planet.

Discovery of 51 Pegasi b by Michel Mayor and Didier Queloz, the first exoplanet orbiting a sun-like star, leading to increased interest and research into planets around other stars.

NASA's New Horizons mission provides the first close-up images of Pluto, revealing a complex and varied geology, with mountains, plains, and signs of possible cryovolcanism.

Discovery of Ceres by Giuseppe Piazzi, the first and largest object in the asteroid belt, which led to the study of numerous other small bodies orbiting between Mars and Jupiter.

Discovery of Neptune by Johann Gottfried Galle, based on predictions by Urbain Le Verrier, which was the first planet discovered through mathematical prediction rather than observation.

Discovery of Pluto by Clyde Tombaugh at the Lowell Observatory, which was later reclassified as a dwarf planet and sparked discussions about what constitutes a planet.

The Event Horizon Telescope captures the first image of a black hole's event horizon, in the galaxy M87, confirming predictions of general relativity and enhancing our understanding of these enigmatic objects.

Voyager 1 becomes the first human-made object to enter interstellar space, providing invaluable data about this boundary region and the heliosphere.

First detection of methane in the atmosphere of Mars by the Mars Express orbiter, indicating potential biological or geological activity.

Philae lander, part of the Rosetta mission, successfully lands on comet 67P/Churyumov-Gerasimenko, marking the first soft landing on a comet, and providing insights into the composition and structure of cometary nuclei.

Discovery of the first extrasolar planets or exoplanets around the pulsar PSR B1257+12 by Aleksander Wolszczan and Dale Frail, leading to the search for planets beyond our solar system and studies on potential alien life.

The Spirit and Opportunity rovers successfully land on Mars, providing extensive geological data and evidence of past water activity on the Martian surface.