Here are some fascinating events:
2015 New Horizons is the first probe to visit Pluto.
2014 Rosetta orbits comet 67P/Churyumov-Gerasimenko and releases Philae, the first probe to land on a comet.
2012 Curiosity rover lands in Gale crater on Mars.
2012 Voyager 1 leaves the solar system and enters interstellar space. It is the most distant man-made artifact.
2006 Pluto is reclassified as a dwarf planet.
2005 The Cassini probe discovers a water-rich plume venting from Enceladus' south polar region.
2005 The Huygens probe detaches from Cassini and lands on Titan, the largest moon of Saturn.
2005 Evidence backs up the hypothesis that the Milky Way is a barred spiral galaxy.
2004 The Hubble Ultra-Deep Field shows galaxies that are almost as old as the universe.
2003 To prevent contamination of its moons, the Galileo probe is plunged into Jupiter's atmosphere.
1997 The great comet Hale-Bopp is visible from Earth.
1994 Comet Shoemaker-Levy 9 is torn apart by Jupiter's mighty gravitational field and eventually collides with the gas giant.
1990 Voyager 1 takes the picture of a Pale Blue Dot. It's the Earth seen from 6 billion kilometers away.
1990 The Hubble Space Telescope is in orbit.
1989 An extraordinary solar flare makes auroras visible at unusually low latitudes, many satellites experience problems, and Quebec is hit by severe blackouts.
1986 Halley's comet moves into the inner solar system and is visible from Earth. The next visit will be in 2061.
1982 Voyager discovers a persistent hexagonal cloud pattern around Saturn's north pole.
1979 Voyager 1 records lightnings in Jupiter's atmosphere.
1977 The Voyager probes are launched towards the outer solar system.
1930 Pluto is discovered.
1859 Urbain Le Verrier recognizes an anomaly in Mercury's orbit. It'll take general relativity to explain it.
1846 Anomalies observed in the orbit of Uranus suggest the existence of a new planet. Neptune is discovered soon after.
1054 The appearance of a new star, which turned out to be a supernova, is recorded all over the world. The remnants of the star have nowadays become the Crab nebula.