Source: https://science.nasa.gov/mars/facts
Title: mars
Selected source excerpts (not the complete document).

Mars is home to the largest volcano in the solar system, Olympus Mons. It dwarfs Earth's highest peak, Mount Everest, which rises 29,029 feet, or 8,848 meters, above the Earth's surface. Olympus Mons stands more than 25 miles (that's more than 132,000 feet, or 40 kilometers) tall from base to summit, with the base covering an area as large as the state of Arizona.

Mars' axis of rotation is tilted 25 degrees with respect to the plane of its orbit around the Sun. This is another similarity with Earth, which has an axial tilt of 23.4 degrees. Like Earth, Mars has distinct seasons, but they last longer than seasons here on Earth since Mars takes longer to orbit the Sun (because it's farther away). And while here on Earth the seasons are evenly spread over the year, lasting 3 months (or one quarter of a year), on Mars the seasons vary in length because of Mars' elliptical, egg-shaped orbit around the Sun.
