Free Explore Mars — Interactive Tools, Calculators & Simulations

Because Mars takes 687 Earth days to complete one full orbit around the Sun, a Martian year is almost twice as long as an Earth year. This means your age in Martian years is roughly half your Earth age. For example, if you are 30 years old on Earth, you are approximately 15.9 years old on Mars. Use our Mars Age Calculator to find your exact Martian age based on your date of birth.

Mars has only 38% of Earth's surface gravity, because it is a smaller, less massive planet. To calculate your Mars weight, multiply your Earth weight by 0.38. For example, if you weigh 160 lbs (72 kg) on Earth, you would weigh just 61 lbs (27 kg) on Mars. Importantly, your mass does not change — only the gravitational force acting on you. This reduced gravity would make you feel incredibly strong, but long-term exposure causes serious bone density loss. Try our Mars Weight Calculator for your exact number.

Your Mars birthday occurs once every 687 Earth days — meaning you only celebrate a birthday on Mars approximately every 1 year and 10 months on Earth. Because of Mars' longer orbit, you accumulate far fewer birthdays over your lifetime. A 30-year-old on Earth has only had about 15 Mars birthdays. Our Mars Birthday Certificate Generator calculates the exact date of your next Martian birthday and creates a downloadable certificate for you.

The Mars Career Test uses a 20-question psychological and skills-based assessment to match you to one of 12 critical roles in a Mars colony, including Colony Engineer, Hydroponics Scientist, Habitat Architect, Medical Officer, and Geologist. Based on your answers, you receive a complete Mars Identity Profile: your colony role, assigned outpost, mission rank, and Martian name. It takes about 5 minutes. Take the Mars Career Test here.

Because both Earth and Mars are constantly moving in their orbits, the distance between the two planets changes dramatically. At their closest approach (opposition), they are about 34 million miles apart. At their farthest (conjunction), over 250 million miles separate them. A radio signal travels at the speed of light (186,000 miles per second), meaning the one-way communication delay ranges from approximately 3 minutes to 22 minutes. In practice, a two-way conversation has a delay of up to 44 minutes. Our Mars Communication Delay Calculator shows the real-time current delay.

Based on current trajectories, NASA's Artemis program aims to return humans to the Moon by the late 2020s as a proving ground. The first uncrewed cargo missions to Mars are projected for the early 2030s. The first crewed Mars landing is targeted by NASA and SpaceX for the late 2030s or early 2040s. A permanent, continuously inhabited outpost could exist by 2050, growing into a small, self-sustaining colony city by 2100. These timelines depend heavily on funding, political will, and technological development. Read our full Mars Colonization Timeline.

Yes, Mars has a significant amount of water, but almost all of it is frozen. Massive water-ice deposits exist at both polar caps, and scientists have confirmed huge subsurface glaciers at mid-latitudes using ground-penetrating radar. NASA estimates that if all of Mars' polar ice melted, it would cover the entire planet in a shallow ocean roughly 35 meters (115 feet) deep. There is also evidence of liquid briny water deep underground. However, extracting and purifying this water for human use is a major engineering challenge, as Martian soil is contaminated with toxic perchlorates.

Mars appears red because its surface is covered in iron oxide — the same chemical compound we call "rust" on Earth. Billions of years ago, when Mars had liquid water and a thicker atmosphere, the atmospheric oxygen reacted with the iron-rich surface rocks, oxidizing them into reddish-brown iron(III) oxide (Fe2O3). Massive global dust storms then lift this fine rust-colored powder high into the atmosphere, giving the entire sky — and the planet as seen from space — its iconic red color. Read our full article: Why Is Mars Red?

No. The Martian atmosphere is extremely thin — only about 1% the density of Earth's atmosphere at sea level — and is composed of approximately 95% carbon dioxide, 2.6% nitrogen, and 1.9% argon. There is almost no free oxygen. An unprotected human on the Martian surface would lose consciousness within 15 seconds and die within minutes from a combination of oxygen deprivation and the near-vacuum pressure. Colonists will require pressurized habitats and spacesuits at all times when outside. NASA's MOXIE experiment on the Perseverance rover has successfully demonstrated that oxygen can be generated from the CO2 atmosphere, which is a critical step for future colonization.

No. Marsodus is an independent educational platform created by space enthusiasts. We are not officially affiliated with NASA, ESA, SpaceX, or any government space agency. However, all scientific data used in our tools and articles — including orbital periods, gravity values, atmospheric composition, and colonization timelines — is sourced from publicly available NASA and ESA research, mission data, and peer-reviewed science. We aim to make that real science accessible, interactive, and personal for everyone.