Mars
55 questions tagged Mars — spanning every one of the seven Ws.
When did the Perseverance rover land on Mars?
NASA’s Perseverance rover landed in Jezero Crater on Mars on 18 February 2021.
When did the Curiosity rover land on Mars?
NASA's Curiosity rover landed in Mars's Gale Crater on 6 August 2012 (UTC), using a daring 'sky crane' landing system.
Which planet has the tallest volcano in the solar system?
Mars has the tallest known volcano: Olympus Mons, which rises about 22 km, roughly two and a half times the height of Mount Everest.
Which is the largest canyon in the solar system?
Valles Marineris on Mars is the largest known canyon system in the solar system, about 4,000 km long and up to 7 km deep.
Why is Mars much colder than Earth?
Mars is farther from the Sun and has a much thinner atmosphere, so it receives less heat and traps far less of it. Its low atmospheric pressure also allows temperatures to swing sharply.
Why does Mars have a thin atmosphere today?
Mars lost much of its atmosphere over time because it is small and has weak gravity, and the solar wind stripped gases away after its magnetic field weakened. The planet could not hold onto as much air as Earth does.
Why does Mars have the largest volcano in the Solar System?
Mars’ low gravity and lack of moving tectonic plates let lava build up in one place for a very long time. That is why Olympus Mons grew to enormous size.
Why do some Martian dust storms become planet-wide?
Mars has very fine, dry dust and a thin atmosphere that can still move it over huge distances once storms start. Seasonal heating can intensify winds until dust spreads across the whole planet.
When was the first spacecraft to orbit another planet launched?
Mariner 9 launched on 30 May 1971 and became the first spacecraft to orbit Mars. It reached Mars later that year.
When was the first successful landing on Mars?
Viking 1 landed on Mars on 20 July 1976. It was the first spacecraft to achieve a safe, successful landing on the planet.
When was the first spacecraft to land on Mars?
Mars 3 made the first soft landing on Mars in 1971.
When was the first spacecraft to orbit Mars?
Mariner 9 became the first spacecraft to orbit Mars in 1971.
When was the first confirmed detection of water on Mars reported?
Strong evidence for water on Mars was reported in 2002 by the Mars Odyssey mission. It detected hydrogen-rich regions near the surface.
Where is Mars's Olympus Mons located?
Olympus Mons is on Mars, in the planet’s Tharsis region near the equator. It is the largest volcano known in the Solar System.
Where is the Valles Marineris canyon system located?
Valles Marineris is on Mars, stretching east of the Tharsis volcanic region near the equator. It is the largest canyon system in the Solar System.
Which planet has the most spacecraft landings?
Mars has had the most successful soft landings of any planet beyond Earth. Dozens of landers and rovers have touched its surface since the 1970s.
How do scientists measure the length of a day on Mars?
They watch landmarks and use spacecraft clocks to time one full rotation. A Martian day, or sol, lasts about 24 hours and 39 minutes.
How do Martian dust storms grow from local storms into planet-wide events?
Strong winds lift fine dust, and once dust is airborne it can warm the atmosphere and strengthen circulation. In some years the storms spread until they cover the whole planet.
How does Mars lose water to space over time?
Water on Mars can freeze, sublimate, or be broken apart by sunlight, letting hydrogen escape into space. Evidence from orbiters shows Mars once had much more water than it does today.
How do scientists search for signs of life on Mars without bringing samples back?
They look for past water, organic molecules, and chemical patterns that may have supported life. Rovers analyze rocks and soil with onboard laboratories and cameras.
Why does Mars have dust storms that can cover the whole planet?
Mars’s thin atmosphere, dry dust, and strong seasonal heating can let small storms grow into planet-wide events that last for weeks or months.
When was Mars first identified as having polar ice caps?
Mars’s polar caps were recognized in the 17th century, with detailed telescopic observations in the 1800s.
When was the first spacecraft sent to Mars?
The first spacecraft to reach Mars was Mariner 4 in 1965.
Where is the Mars rover Perseverance exploring?
Perseverance is exploring Jezero Crater on Mars. The rover landed there on 18 February 2021.
Where did NASA land the Curiosity rover on Mars?
Curiosity landed in Gale Crater on Mars. It touched down on 6 August 2012.
Where is Olympus Mons located?
Olympus Mons is on Mars. It is the largest volcano in the Solar System, rising about 22 kilometers above the surrounding plains.
Where is Valles Marineris located?
Valles Marineris is a vast canyon system on Mars. It stretches for about 4,000 kilometers across the planet’s surface.
Where is the biggest dust storm zone on Mars typically found?
Mars’s largest dust storms often form in the southern hemisphere, especially during the planet’s spring and summer. These storms can grow to cover the whole planet.
Where is Mars’s north polar layered deposit located?
Mars’s north polar layered deposit surrounds the planet’s north pole. It is a stack of ice and dust layers recording past climate changes.
Which planet has the deepest known canyon system?
Mars has the deepest canyon system in the Solar System: Valles Marineris. It is about 4,000 kilometers long and in places up to 7 kilometers deep.
Which planet has the most Earth-like length of day?
Mars has the most Earth-like day length, with a rotation period of about 24 hours 39 minutes. A Martian day is called a sol.
Whose spacecraft first landed on Mars successfully?
NASA’s Viking 1 was the first successful soft landing on Mars. It touched down on 20 July 1976 and operated for years.
Whose mission first mapped the gravity field of Mars in detail and revealed hidden differences beneath the surface?
That was NASA's Mars Global Surveyor, launched in 1996. It produced detailed maps that helped reveal variations in Mars's crust and interior.
Whose rover first drilled into Martian rocks and analyzed their chemistry on the surface?
That was NASA's Spirit rover, with major surface drilling and rock analysis work on Mars after its 2004 landing. It examined rocks and soils at Gusev Crater for years.
Whose name is associated with the first spacecraft to orbit Mars successfully?
That was Mariner 9, a NASA mission that entered Mars orbit in 1971. It was the first spacecraft to orbit another planet.
Whose observations of Mars helped reveal that the planet has giant volcanoes and a canyon system larger than anything on Earth?
NASA's Mariner 9 made those observations in 1971. It was the first spacecraft to orbit Mars and returned the first close-up global view of the planet.
How does Mars get its blue sunsets and red skies?
Dust in Mars’s thin atmosphere scatters sunlight differently than Earth’s air, making sunsets appear blue while the daytime sky often looks butterscotch or reddish.
How do scientists know Mars had water in the past?
They have found dried river channels, lakebeds, minerals formed in water, and sediments that show Mars once had a wetter climate.
Why does Mars have such a thin atmosphere compared with Earth?
Mars is smaller and lost much of its early atmosphere because weaker gravity and solar wind made it harder to retain gases.
Why do Earth and Mars have such different-looking volcanoes?
Mars has giant broad shield volcanoes because its lower gravity and lack of plate tectonics let lava pile up in one place for a very long time. Olympus Mons is the largest volcano in the Solar System.
Why are there such huge dust storms on Mars?
Mars has a thin, dry atmosphere that lifts dust easily, and once storms start they can spread around the planet. Global dust storms can last for weeks or months.
Why are the polar ice caps on Mars made of both water and carbon dioxide ice?
Mars is cold enough for both water ice and dry ice to exist at the poles. Seasonal carbon dioxide frost grows and shrinks each Martian year.
When was the first successful robotic landing on Mars?
The first successful Mars landing happened on 20 July 1976, when NASA’s Viking 1 lander touched down on the planet.
When was the first image taken from the surface of another planet?
The first image from another planet’s surface was taken on 20 July 1976, when Viking 1 landed on Mars.
When did the first Mars rover begin exploring the surface?
The first successful Mars rover, Sojourner, began surface operations on 5 July 1997 after landing with the Pathfinder mission.
Where is Valles Marineris found?
Valles Marineris is on Mars, stretching along the planet’s equatorial region. It is the largest canyon system in the Solar System.
Where on Mars is the Medusae Fossae Formation?
The Medusae Fossae Formation is near Mars’s equator, between Tharsis and Elysium. It is one of the planet’s largest deposits of loose, layered material.
Where is the largest volcano in the Solar System not on Earth?
It is on Mars: Olympus Mons. It rises about 22 km above the surrounding plains.
Which planet has the largest known canyon?
Mars has the largest known canyon system in the Solar System: Valles Marineris. It stretches about 4,000 km and is up to 7 km deep.
Which planet has the tallest known mountain?
Mars has the tallest known mountain in the Solar System: Olympus Mons. It rises about 22 km above the surrounding plains.
Which planet is known to have the biggest volcano cluster?
Mars has the Solar System’s biggest volcano cluster in the Tharsis region. This vast volcanic plateau contains several giant shield volcanoes, including Olympus Mons.
Which planet has the largest known dust storms?
Mars is known for planet-wide dust storms, the largest in the Solar System. Some of them can grow to cover the entire planet.
Which planet has the largest known volcano in the Solar System?
Mars has Olympus Mons, the largest known volcano in the Solar System. It rises about 22 kilometers above the surrounding plains and spans roughly 600 kilometers across.
Whose mission first returned close-up images of Mars’s surface?
NASA’s Mariner 4 sent the first close-up images of Mars in 1965. The pictures showed a cratered, Moon-like world rather than the canal-covered planet some had imagined.
How much of Mars is covered by dust and rock?
Mars is covered by a global layer of dust and broken rock, with dunes, regolith, and bare volcanic surfaces across much of the planet.