I wanted to share something that happens when you regularly visit schools and talk about something awesome like exploring Mars: the job isn’t just answering questions for kids at the school on the day, it also usually means answering questions for kids (and adults) who couldn’t make it or didn’t have time to ask their question on the day too!

After my run of school visits recently one of the teachers at a school I spoke at was bombarded by their 9-10 year olds who didn’t get a chance to ask everything they were curious about, so when I made my usual offer to answer via email they took me up on it. For those of you curious about what sorts of questions I usually get from students and the answers I give them, read on!


Is part of your job to look for any precious stones on Mars? We won’t be looking specifically for precious stones on Mars, but we will definitely spend a LOT of time looking at the rocks on Mars! Studying the rocks on Mars can tell us more about Mars what it might have been like in the past and where the water is. We’ll also have to study the rocks on Mars if we ever want to try to find alien life there, because if we’re going to find fossils or even living alien microbes or bacteria, they’ll be living in or on the rocks!

How do you eat with your helmet on? Inside the habitat you don’t need a spacesuit, so you can just wear normal clothes and eat/drink normally. When you go out onto the surface however you need to wear the bulky spacesuit with the helmet for up to 7 hours at a time. There’s a bag of water inside the spacesuit with a straw next to the astronaut’s head they can sip from, and there’s is a pouch below their chin they can reach down with their teeth to pull up a fruit & cereal bar to eat if they get hungry. The water is pretty easy, but the fruit & cereal bar is really awkward, plus they have to eat all of it straight away so that they don’t have crumbs floating around inside their helmet! Eating with a spacesuit on is really difficult, so most astronauts eat before they put the spacesuit on to go outside.

What does the impact feel like when you land the space craft? Depending on the spacecraft it can be either really gentle like a passenger plane landing, or it can be incredibly jarring and potentially break your back! The space shuttles landed just like a plane, and even though they were going much faster than a jet when they touched down, they could still be very gentle. A Soyuz capsule however fires a single rocket blast a few meters above the ground to make an impact that could kill you a tiny bit gentler! The spacecraft that will land us on Mars will almost certainly use rockets for a lot longer to land much gentler than the Soyuz, but not as gentle as landing like a plane with a space shuttle.

Soyuz landing with retrorockets firing (middle) and impact (right)

What happens if you stay on the surface of Mars longer than one hour? There’s no problem staying on the surface of Mars longer than an hour, and we’ll regularly need to go outside for a lot longer than an hour to make repairs and explore. At the moment though our spacesuits don’t provide any extra protection from the radiation on the surface of Mars, so if we went outside for more than an hour every day then we’d be exposed to too much radiation. We might go outside for 7 hours one day, but then we might stay inside for the rest of the week! It’s all about making sure you don’t go out on the surface more than an hour per day on average, because if we do we’ll increase our risk of cancer and other radiation illnesses beyond the approved limit.

How will you grow fruit and veggies with all the gases in the Mars environment? A friend of mine has been researching exactly what mix of gas would be best for growing fruit and veggies on Mars! The atmosphere on Mars is too thin to grow things outside of a sealed habitat, but she found that if we took the atmosphere on Mars and pressurised it, then added a little bit more oxygen (made by extracting water from the soil then splitting it into hydrogen and oxygen) then you would have the perfect mix of gas for growing plants! Humans couldn’t breathe it because there would be way too much carbon dioxide, but plants would flourish.

What type of plants grow on Mars? No plants yet, but once we start landing greenhouses and habitats there we’ll be able to start! So far Mars One has tested growing radishes, peas, rye and tomatoes and shown that they are completely safe to eat when grown in soil with the same soil with a mix of minerals and heavy metals as we’ve detected on Mars. There are 6 other crops that we know will grow in that same type of soil, but they haven’t finished testing to see if the heavy metals have been absorbed by the plants yet.

The first harvested tomatoes from Mars soil simulant.

Have you discovered any space junk on Mars yet? Depending on who you ask, there’s a few things on Mars some people might call junk that others call “historical sites”! We know the Beagle 2 probe landed on Mars safely in 2003, but it never deployed all it’s panels so it eventually ran out of power and is sitting dead on the surface of Mars. There are rovers like Sojourner and Spirit that have now failed too. Plus there’s stuff on Mars that really is junk – the heat shield that protected the Curiosity rover as it traveled through Mars’s atmosphere was dumped mid-air so that the skycrane could deliver the rover to the surface, plus the skycrane itself crash landed somewhere on Mars afterwards too! There’s a few bits of human junk on Mars, but not a lot – it’s pretty tough to get things there, so we want everything we send to Mars to be as useful as possible.

How can you live without your family? Lots of people in history have had to say goodbye to their friends and family in order to explore places that people have never been before. Most explorers plan to come back again, but millions of people said goodbye to their families forever when they immigrated from places like England to Australia, or from Ireland to the USA. Those families would know that they were starting a new life somewhere else, and while they would miss them they knew that life itself is a one-way mission.

How do you wash your clothes on Mars? We’ll have to be very careful to conserve water on Mars, plus the reduced gravity on Mars means we won’t sweat into our clothes as much as we do on Earth so we probably won’t need to wash our clothes as regularly. There’s still some gravity though, so we’ll either wash by hand in a tub of water or if we’re really lucky someone might design a washing machine that works in the reduced gravity on Mars.

How do you play sport on Mars? We might not be able to play lots of team sports on Mars, and if we do it’ll be really difficult in our spacesuits outside! People have done it though – in 1971 Alan Shepherd played golf on the Moon after sneaking a golf club and some balls onto Apollo 14 before the launch! Mostly we’ll stay fit and healthy by using equipment like you’d see in a gym, but designed to work on Mars.

How do you get materials to Mars to grow crops? The soil on Mars (called “regolith”) has almost everything you need to grow plants, except it doesn’t have any living bacteria or microbes to support the plants. So one option shown in the movie “The Martian” is to use the regolith along with waste from the toilet (after it’s been treated) to make soil that plants will grow in!

What type of safety equipment would you use most of? We’ll use a lot of different safety equipment in all sorts of different ways on Mars, but one of the most important is something as simple as a cable to hook your spacesuit onto! In space it’s VERY important to tether yourself during a spacewalk because you could float away if you aren’t hooked on to the spacecraft, but on Mars hooking yourself onto a cable between you habitat and a rover could mean the difference between finding the habitat in the dark after a long spacewalk, and getting lost in the dark!

Are you hoping to find aliens on Mars? I think we’ll find aliens on Mars, but they won’t be little green men or Marvin the Martian – they’ll be bacteria, microbes, and maybe something like a tardigrade. Tardigrades are these tiny little creatures smaller than a pinhead that are incredibly tough: surviving radiation, freezing cold, blistering heat, and even the vacuum of space! We know that Mars had water and was more habitable than Earth a few billion years ago, so it’s even possible that life started on Mars, hitched a ride to Earth on a meteorite, and we’re actually all descended from Martians!

Tardigrade (Approx. 1mm long)

How do you drink fluid on Mars? You can drink on Mars just the same as on Earth, except water will pour out nearly 3 times slower than it does on Earth. It means that for things like showers, you might get really big droplets instead of the ones you’re used to from your shower at home, but drinking will be just the same.

Will you have a car on Mars? The first people on Mars won’t have a car, but when they first land on Mars they might sit on a rover and have it take them from where they landed to the habitat that the rovers have setup for them. Sending a car or truck for Mars means lots of weigh, and we are only sending just what we need when we first go. In the future though we will definitely want someone to bring a car or big rover we can live inside so we can explore much further from the habitat than we can just walking or sitting on a normal rover.

How high can you jump on Mars? Mars has 38% of Earth’s gravity, so you provided your legs muscles are still as strong on Mars as they were on Earth, you’d be able to jump nearly 3 times higher!

Will you get sick of eating the same food all the time? We have to be really careful about making sure there is lots of variety in our food, because people DO get sick of eating the same thing all the time and it’s important for people’s mood. The very first mission NASA carried out at their Mars simulation mission in Hawaii was to see how they could add variety to the meals while people were living in a white dome with only limited food selections. For 4 months the people inside needed to work out how to use the same few ingredients they had to make all sorts of new dishes. So learning to be creative and take what you have and turn it into something new and different is one of the most important skills a Mars colonist will need to have.

Hi-SEAS in Hawaii