Astrogeology is the study of the geology of celestial bodies, such as planets, moons, and asteroids.

Astrogeology has contributed to space exploration by helping to select landing sites, by helping to understand the hazards that astronauts may encounter on other worlds, and by helping to develop new technologies for space exploration.

Astronauts may encounter a variety of hazards on other worlds, including radiation, extreme temperatures, and dust storms.

Studying astrogeology can help us to understand the history of the solar system, to find new resources, and to develop new technologies.

The most common type of rock on the Moon is basalt, a dark, volcanic rock.

Valles Marineris is the largest canyon in the solar system, stretching for over 4,000 kilometers (2,500 miles) across the surface of Mars.

Olympus Mons is the highest mountain in the solar system, rising over 21 kilometers (13 miles) above the surface of Mars.

Ganymede is the largest moon in the solar system, and it is even larger than the planet Mercury.

Terrestrial planets are the most common type of planet in the solar system, and they include Mercury, Venus, Earth, and Mars.

The Sun is composed of mostly hydrogen and helium, with trace amounts of other elements.

The average temperature of the Sun's surface is 5,778 K (10,333 °F).

The Sun's diameter is 1.39 million kilometers (864,000 miles).

The Sun's mass is 1.989 × 10^30 kilograms (4.38 × 10^30 pounds).

The Sun is about 4.6 billion years old.

The Sun will eventually become a white dwarf, a dense, hot core of carbon and oxygen.