A Trip to Mars!
Imagine being able to catch a flight to Mars as easily as we travel to another country – that was the idea behind the Trip To Mars session I attended at the Cheltenham Science Festival. It was conducted by Dr Suze Kundu and Dr Simon Foster and presented as a pre-flight safety briefing, with both of them dressed as pilots! There were a lot of humorous moments and sci-fi references but also some great science.
Suze and Simon suggested that in the future, flights to Mars could be far quicker than they are now, and explored how some of the bigger problems could be overcome. For example, the Sun’s magnetic field deflects a significant proportion of the cosmic radiation that could be harmful to humans on Earth; as spaceships travel further away from the Earth and Sun they will have less protection because the magnetic field weakens. To combat this it’s possible that spaceships will contain or be covered with large and powerful magnets, to produce the same deflective effect. This would have the added advantage of also deflecting radiation from solar flares.
Spaceships journeying to Mars would travel at such speed that even tiny fragments of rock and dust could be damaging to the hull. To combat this, and also the heat generated when the spaceship passes through an atmosphere, Suze and Simon discussed the possibility of spaceships being coated in aerogel. This amazing material is a solid formed from silicone dioxide but is 98% air; this means that it is extremely light but also strong. Its melting point is 1,200°C (equivalent to asbestos) and it is a wonderful insulator. Because it consists of large pockets of air between thin layers of silicone dioxide, any dust or rock fragments that hit it would be slowed and stopped before they could penetrate the aerogel completely.
Suze and Simon also discussed the possibilities and problems with cryostasis. Theoretically this is when a person’s body is cooled to temperatures so low that they enter hibernation, ideal for long journeys through space. Unfortunately our technology isn’t advanced enough to do this at the moment; any attempt would result in the cells rupturing and the person dying. But in the future it will be possible, perhaps after the person’s DNA has been altered slightly so that they can produce antifreeze proteins like some species of wasps and turtles.
A Short Story – The White Dove
Dad walks over to me. He’s carrying several slices of bread.
‘Hi, Grace.’
‘Hi,’ I say, giving him a look which I hope he understands means, I am so not impressed with this new pre-birthday arrangement.
Dad doesn’t seem to have noticed my look. I wonder what he’s doing with the bread.
‘For the ducks,’ he says when he catches me staring at it.
I nod and decide not to mention that I am no longer five years old and that feeding the ducks in the park doesn’t exactly excite me anymore.
‘Right,’ I say, as we head over to the pond.
‘So, Grace, how have you been?’
We sit down on the bench next to the willow tree.
Top to Bottom – Written By You
Rebecca is 9 years old and is due to move to a new school soon. She wrote for us about her fears and her hopes for the big changes coming to her life.
What is Geocaching?
What is Geocaching? It’s like a real-life treasure hunt and is a great way to make a walk in the woods just a bit more interesting!
Julianne Robertson explains what it is and how to do it.
What is it?
Players use a handheld GPS device or a smartphone to look for a set of co-ordinates near to wherever they are and find the geocache (or treasure!) hidden at that location. These are usually a small container of some kind with a logbook and ‘treasure’ inside – this can be anything, like a little toy, some stickers, a badge, a pretty stone – basically anything small enough to fit inside and be worth finding!
Sounds good! How do I get started?
Go to the website www.geocaching.com and register – it’s free to sign up. Then you put in your postcode and you should see a list of all the geocaches near to where you live. Choose one and you’ll get the co-ordinates you need to put into the GPS, as well as a description of the area and clues about how to find the cache.
Are geocaches always hidden in the woods?
No – there are geocaches all over the world and they are usually put in places which are important to the person hiding them. Some are hidden in forest areas, others are in local parks, or city streets – even underwater! There are also different sizes of geocache and a range of difficulty – you should probably start with one that’s easy, at least to begin with!
What do I do when I find one – can I keep the treasure?!
Yes, but you should replace anything you keep with something of equal or greater value. You should also write about your find in the logbook and when you get home log your experience on the website too, so that others know the cache is still active.
Can I hide my own cache for others to find?
Yes, once you’ve found a few caches you’ll know what makes a good geocache and hiding place, and you might want to create your own! There are lots of guidelines on the website about how to do it.
Now you know about geocaching – go and try it! It’s a great activity to do with your family or a group of friends. Once you’ve found one, you’ll want to find more!
Julianne Robertson is a freelance journalist, based in Dundee. Her background is radio news, and she now writes features and reviews, specialising in parenting, faith and religion, events and lifestyle issues.