951 Gaspra

An irregularly shaped, 19 x 12 x 11 kilometer S-type asteroid discovered in 1916 that became the first asteroid ever photographed up close when the Galileo spacecraft flew past it in 1991.

A robotic spacecraft launched in 2014 that rendezvoused with asteroid Ryugu, deployed multiple landers, collected samples through two touchdowns, and successfully returned 5.4 grams of material to Earth in December 2020.

Mars

A cold, dusty red planet with massive extinct volcanoes, deep canyons, frozen polar caps, and evidence of ancient water flows, making it the most Earth-like planet in the Solar System.