Context: A recent study carried out by the US researchers has found that toxic dust on Mars would make a future mission to the red planet extremely hazardous for astronauts.
Relevance of the Topic:Prelims: Key facts about Mars; Mars Missions.
Major Highlights of the Report

- Fine dust: The size of a Martian dust particle is quite small (it is about 4% the width of a human hair). The fine particles of the dust could penetrate deep into the lungs and enter the bloodstream and cause respiratory issues.
- Toxic elements in Martian dust: Silica, gypsum, perchlorates, chromium, arsenic and nanophase iron oxides. The impact of these toxins could be more significant due to microgravity and radiation on Mars.
- Dust storms: Every Martian year (which lasts ~687 Earth days), the planet witnesses regional dust storms. Every three Martian years, these storms grow into planet-encircling dust storms.
The use of air filters, self-cleaning space suits and electrostatic repulsion devices (remove dust particles) can limit exposure to dust.
Facts about Mars
- Fourth planet from the Sun and second-smallest planet in the Solar System. Mars is about half the size of Earth.
- Similarity to Earth (Orbit and Rotation):
- Mars rotates every 24.6 hours, which is very similar to one day on Earth (23.9 hours).
- Mars' axis of rotation is tilted 25 degrees with respect to the plane of its orbit around the Sun. Earth’s axial tilt is 23.4 degrees.
- Like Earth, Mars has distinct seasons, but they last longer than seasons on Earth since Mars takes longer to orbit the Sun.
- Red Planet: Mars looks reddish due to oxidation or rusting of iron in rocks, and dust of Mars.
- Mars has a thin atmosphere made up mostly of carbon dioxide, nitrogen and argon gases.
- Mars has no magnetic field, but certain areas of Martian crust in the southern hemisphere are highly magnetised, indicating traces of a magnetic field.
- Mars has two small moons, Phobos and Deimos, that may be captured asteroids.
- Mars has the largest volcano in the solar system i.e., Olympus Mons. It is 3 times taller than Earth's Mt. Everest.
Martian Missions:
- The Soviet Union in 1971 became the first country to carry out a Mars landing, Mars-3. The second country to reach Mars’s surface is the USA.
- India’s Mars Orbiter Mission (Mangalyaan) was launched from Satish Dhawan Space Centre in Andhra Pradesh by ISRO in 2013.
Reasons for fascination with Mars:
- Mars has several Earth-like features– such as clouds, polar ice caps, volcanoes, and seasonal weather patterns.
- Life may have evolved on Mars in the past. Conditions on early Mars were very similar to that of Earth. It was once warm enough to allow water to flow through it. It had a thick atmosphere, which enabled stability of water on the surface of Mars.
- Mars is the only planet that humans can visit or inhabit in the long term. Mars is comparatively hospitable in terms of temperature, with an approximate range between 20 degrees Celsius at Equator to minus 125 degrees C at poles.
However, no human has set foot on Mars because the atmosphere on Mars is very thin, consisting of mostly carbon dioxide with no breathable oxygen, making it difficult for astronauts to survive there.








