MARS

🚀 🪐 Mars: The Red Planet 🔹 Basic Characteristics Position: 4th planet from the Sun Diameter: ~6,779 km (about half of Earth’s 12,742 km) Mass: 0.11 Earths Gravity: 3.71 m/s² (38% of Earth’s – you’d weigh much less!) Length of Day: 24 hours, 37 minutes Length of Year: 687 Earth days Moons: Phobos (larger, closer) and Deimos (smaller, farther away) 🔹 Surface & Geology Color: Appears red due to iron oxide (rust) on its surface. Terrain: Mountains, valleys, craters, deserts, and dry riverbeds. Major Features: 🗻 Olympus Mons – tallest volcano in the solar system (21 km high, ~3x Mount Everest). 🌄 Valles Marineris – a canyon system ~4,000 km long, 200 km wide, and up to 7 km deep. 🧊 Polar Ice Caps – made of water ice and carbon dioxide ice (dry ice). 🔹 Atmosphere Composition: 95.3% Carbon Dioxide (CO₂) 2.7% Nitrogen (N₂) 1.6% Argon (Ar) Trace oxygen & water vapor Pressure: <1% of Earth’s atmosphere (too thin to breathe). Weather: Very cold (average –63°C, but can range from –125°C at poles to +20°C near equator in summer). Frequent dust storms; sometimes cover the whole planet. 🔹 Water on Mars Evidence of ancient rivers, lakes, and possibly oceans. Today: water exists as ice at the poles and beneath the surface. Some seasonal flows of salty liquid water may exist. 🔹 Exploration Spacecraft & Rovers Past Missions: Viking 1 & 2 (1970s, first landers). Current Rovers: Curiosity (2012 – studying climate & geology). Perseverance (2021 – looking for ancient microbial life, collecting samples). Ingenuity helicopter (first powered flight on another planet). Orbiters: Mars Reconnaissance Orbiter, MAVEN, Mars Express, and more. 🔹 Potential for Life No confirmed life found. Conditions billions of years ago were warmer and wetter—could have supported microbes. Current research: looking for biosignatures in rocks and soil. 🔹 Human Colonization Mars is the most Earth-like planet after Earth. Challenges: Thin, toxic atmosphere (no breathable oxygen). Radiation exposure (no strong magnetic field). Cold climate. Solutions: Habitats with life support. Growing plants in controlled greenhouses. Using Martian resources (water ice, CO₂ for fuel). 🔹 Fun Facts A sunset on Mars looks blue due to its thin atmosphere. Phobos is slowly spiraling toward Mars and will eventually crash or break into a ring. If you weighed 60 kg on Earth, you’d weigh only 22.8 kg on Mars.