The most difficult Mars riddles A list of Mars related questions that are most often answered incorrectly Astronomy quiz How long is stellar year on Mars?687 Earth days. The Martian year is almost twice longer than Earth's year.very hard 28% 687 Earth days687 Earth days28%423 Earth days423 Earth days13%183 Earth days183 Earth days18%121 Earth days121 Earth days39%Created by: Tschuka . Statistics based on 1813 answers in 2 languages »planets riddles » Which rover was the first to explore Mars?Sojourner was the first Mars rover. It was much smaller then Curiosity, whose wheel is about the size of the whole Sojourner. It landed on July 4, 1997 as part of Mars Pathfinder mission on Mars's Ares Vallis and remainded in contact with Earth till September 27, 1997.very hard 31% CuriosityCuriosity31%OpportunityOpportunity19%SojournerSojourner31%SpiritSpirit18%Created by: smyru. Statistics based on 4369 answers in 2 languages »space riddles » What was the first probe that successfully landed on Mars?Viking 1 was the first of two spacecraft (along with Viking 2) sent to Mars as part of NASA's Viking program. On July 20, 1976, it became the first spacecraft to land successfully on Mars and perform its mission. Viking 1 held the record for the longest Mars surface mission of 2307 days until that record was broken by Opportunity on May 19, 2010.very hard 37% CuriosityCuriosity23%Viking 1Viking 137%Pionner 10Pionner 1024%Luna 1Luna 115%Created by: Tschuka . Statistics based on 5182 answers in 2 languages »astronautics riddles » Mars colonisation is a hype topic. What is the biggest threat for those wishing to take a part in a journey to Mars?Cosmic rays. The only efficient protection against high energetic cosmic radiation, one we are granted with, is Earth magnetic field. Both during a long flight to Mars and through the stay on the planet, that did not form electromagnetic field, astronauts would be exposed to ionization. hard 53% low temperatureslow temperatures9%lack of oxygenlack of oxygen28%poor gravitypoor gravity7%cosmic rayscosmic rays53%Created by: smyru. Statistics based on 18192 answers in 2 languages »Solar System riddles » Olympus Mons is the largest known volcano. Where is it?On Mars. Olympus Mons (Latin for Mount Olympus) is a large shield volcano on the planet Mars, having a height of nearly 22 km (14 mi). Being a shield volcano, it has a very low profile. The average slope on the volcano's flanks is only 5°. Because of that, an observer standing on the Martian surface would be unable to view the entire profile of the volcano, even from a great distance.average 62% in Australiain Australia5%in Indonesiain Indonesia12%in Antarcticain Antarctica19%on Marson Mars62%Created by: Trương Ngọc Hùng. Statistics based on 21449 answers in 4 languages »volcanoes riddles » Play astronomy quiz and see all the questions.