Astrogeology is the study of the geology of planets and moons, including their composition, structure, and history.

Sojourner was the first rover to land on Mars, as part of the Mars Pathfinder mission in 1997.

Mars is known as the "Red Planet" due to the presence of iron oxide on its surface, which gives it a reddish hue.

Olympus Mons is a volcano located on Mars and is the largest known volcano in the solar system.

Valles Marineris is a canyon located on Mars and is the largest known canyon in the solar system.

Huygens was a probe that landed on Titan, the largest moon of Saturn, in 2005.

Mars 2020 is a mission that launched in 2020 and is searching for signs of life on Mars.

Kepler is a telescope that was launched in 2009 and is searching for Earth-like planets around other stars.

SETI is an organization that is dedicated to the search for extraterrestrial intelligence.

The Allen Telescope Array is a radio telescope that is used to search for signals from extraterrestrial civilizations.

The Drake equation is an equation that is used to estimate the number of extraterrestrial civilizations in the Milky Way galaxy.

The Fermi paradox is a paradox that questions why we have not yet made contact with extraterrestrial civilizations.

The Kardashev scale is a scale that is used to measure the technological advancement of extraterrestrial civilizations.

The Sagan equation is an equation that is used to estimate the amount of time it will take for an extraterrestrial civilization to reach a certain level of technological advancement.