The Red Planet is a desolate world of extreme temperatures and ancient volcanic giants
In short: Mars is a desert-like, rocky world with a tenuous atmosphere of carbon dioxide. While it hosts massive extinct volcanoes and vast canyons, it is also a place of bitter cold, where temperatures can plummet to −153 °C. It is currently the only planet inhabited entirely by robots.
Positioned fourth from the Sun, Mars represents the final terrestrial planet. Its surface is defined by a distinct dichotomy: the northern hemisphere consists of low-lying, relatively flat plains, while the southern hemisphere is composed of cratered highlands. This landscape is home to extraordinary geological features, including Olympus Mons, an extinct volcano standing 21.9 km tall, and Valles Marineris, a canyon system stretching 4,000 km in length.
The planet's history is divided into distinct geological epochs. During the Noachian period, roughly 4.5 to 3.5 billion years ago, Mars experienced heavy meteor impacts and the possible presence of liquid water oceans. This was followed by the Hesperian period, starting about 3.5 billion years ago, which was characterized by intense volcanic activity and widespread flooding that carved immense outflow channels. Today, the planet is in the Amazonian period, where geological processes continue to shape the surface.
Life on Mars remains a primary scientific mystery. While the planet currently lacks liquid surface water—retaining water instead in the ground, as frost, or in polar ice caps—the possibility of past or present life is a subject of active investigation. Robotic explorers like the Perseverance and Curiosity rovers are currently traversing the surface to uncover billions of years of history and search for traces of life.
The Martian environment is incredibly harsh. The atmosphere is thin, with pressure at the surface being only a few thousandths of Earth's. Because of its 25-degree axial tilt, Mars experiences seasons similar to Earth, though its solar year lasts 687 Earth days. Even with weak winds, fine dust is prevalent across the surface and atmosphere, easily picked up by the low Martian gravity.
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Sources
- Source: CrashCourse — Mars: Crash Course Astronomy #15 · YouTube (embedded player only)
- Also: Mars
- Also: Mars - NASA Science
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