Mars HorizonCosy up and snuggle down, for tonight we explore our inner solar system with Mars Horizon.You find yourself in what appears to be a huge field. It's flat as far as the eye can see, except for when you turn around, a number of varying size buildings dominate the landscape. There are towers and a large building that connects to a number of smaller buildings around it. To you it looks like a hospital, you know different buildings will help people in different ways. Intrigued, you make your way towards the main building. Because the building is so large, you miscalculate it's distance from you. It takes a little longer to wander over to it than you thought, but this time allows you to study the place more. You realise what you mistook for towers weren't towers, but intricate scaffolding. You also notice the flags on the buildings. The main building houses lots of different countries' flags as well as another flag you don't recognise. This flag has a space shuttle blasting off what appears to be Earth with a massive smoke trail behind it and heading towards a red planet. You realise you must be at some kind of space agency, and the towers you noticed are the launch pads for rockets that explore our tiny, local part of this vast universe.Before you know it, you're standing in the atrium of the building you were heading towards. It's a light and spacious lobby that has rockets, spacecraft, rovers, pictures and many more models - exhibiting the history and legacy of this agency. You're impressed and are captivated by all this history which surrounds you. Before you're able to get too lost in your thoughts, you're approached by a soft-smiling person who indicates for you to follow them. Something about their face is familiar, and you are here to complete a mission it seems. Without hesitation, you follow them through the security areas and enter the heart of the building. As you make your way through the building you notice more pictures of space that you'd never seen before. Some of the missions from this agency have been highly successful it seems, and you're keen to see what your mission will be.You and your companion finally approach a large door which they unlock with a keycard. Almost like the doors of an elevator, they peel away in layers revealing a huge room with hundreds of desks facing the wall in front which has numerous large screens across its width. You know that this is the beating heart of the agency, the operations centre. From here, every rocket, shuttle and satellite is launched and the low whirring of the computers' fans, the quiet chatter from the people and the beeps from the various space missions create a sound of determined calm. Everyone knows what they're doing, only talking when they need to confirm or collaborate. Your guide nods towards the front of the room where a seat has been left for you. You're not sure yet what you're supposed to do, but you walk towards the desk and take a seat. With a tap of a button your screens come to life and takes you directly into a program that has some simple maths equations. A little bit of addition, some subtraction as well as some fractions pop up on screen. You answer nearly all the questions perfectly, only miscalculating one of the fractions. But it's ok and it doesn't stop you from getting to the next screen. You turn to look at your guide, but they're gone. There is no-one sitting either side of you, so you decide to continue exploring the program which brings up a pop-up message. "Welcome to the Checkpoint Space Agency. Today we will launch a satellite that will travel across our solar system to study Haumea (Ho-ME-Ah), a dwarf planet on the edge of our solar system," the message reads. Your eyes light up. You remember this planet from looking at space books when you were very small with your parents. You remember its potato-like shape and its red eye. You remember wondering what it would be like to sit on the edge of the solar system looking back at