The first exoplanet orbiting a Sun-like star, 51 Pegasi b, was discovered in 1995 using the Hubble Space Telescope.

The first black hole, Cygnus X-1, was discovered in 1971 using the Chandra X-ray Observatory.

The first gravitational waves were discovered in 2015 using the Laser Interferometer Gravitational-Wave Observatory (LIGO).

The first pulsars were discovered in 1967 using the Arecibo Observatory.

The first quasars were discovered in 1963 using the Palomar Observatory.

The first extragalactic planets were discovered in 1992 using the Hubble Space Telescope.

The first brown dwarfs were discovered in 1995 using the Keck Observatory.

The first Kuiper Belt objects were discovered in 1992 using the Hubble Space Telescope.

The first trans-Neptunian objects were discovered in 1992 using the Hubble Space Telescope.

The first interstellar objects were discovered in 2017 using the Hubble Space Telescope.

The first rogue planets were discovered in 2006 using the Hubble Space Telescope.

The first super-Earths were discovered in 2005 using the Hubble Space Telescope.

The first Earth-like planets were discovered in 2007 using the Hubble Space Telescope.

The first habitable planets were discovered in 2011 using the Hubble Space Telescope.

The first planets outside our solar system were discovered in 1992 using the Hubble Space Telescope.