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Space telescope launched by NASA to detect X-ray emissions from very hot regions of the universe.

First spacecraft to reach interstellar space.

First major optical telescope placed in space.

Landmark mission featuring a lander and a lightweight rover (Sojourner) on the surface of Mars.

First successful Mars lander and provided the first high-resolution images of the Martian surface.

First spacecraft to orbit Mercury.

Space telescope designed to discover Earth-like planets orbiting other stars.

Mission to study Jupiter's composition, gravity field, magnetic field, and polar magnetosphere.

First spacecraft to successfully land on Venus and transmit images from the surface.

First spacecraft to travel through the Asteroid belt and make direct observations of Jupiter.

Mission to study the planet Jupiter and its moons.

First spacecraft to conduct a flyby of Pluto.

First manned mission to land on the Moon in 1969.

Mars rover designed to explore the Gale crater as part of NASA's Mars Science Laboratory mission.

Twin rovers that explored the Martian surface and geology.

First successful flyby and examination of Mars.

First spacecraft to orbit a comet (67P/Churyumov-Gerasimenko) and deploy a lander to its surface.

Advanced space telescope designed to succeed the Hubble Space Telescope as the premier space observatory.

First artificial Earth satellite.