Astronomers use light to determine the chemical composition that exists in space images in order to determine the speed and direction of movement. While it may seem to viewers that stars and planets are moving slow, that is far from accurate. For example, when we look up and see a star at 10 pm in the sky and then we come back at 1 am and see what we may believe is the same star, this is probably not true. The speed of space travel is called a light year; we could consider this meter as we would consider movement on Earth as a Mile Per Hour(MPH). Of course, a light year is much faster than a MPH, but for the purpose of comparing movement to something relative to earth life, it works. The speed of which an object moves is determined by that objects energy intensity. This varies from object to object, there is not a set intensity from object to object, however, there is a formula to calculate the speed. The direction of movement that the object has is determined by the inertia of that object. This inertia is how astronomers know which direction the object will travel (I.E. orbit).
During class, we have discussed inertia and what factors contribute to how a planet may orbit such as mass. In our lecture tutorial workbooks we have seen that higher inertia will cause a planet to move more quickly.
During this post, I found a really cool article at http://www.globalresearch.ca/the-niburu-planet-x-system-and-its-potential-impacts-on-our-solar-system/5459788 There is a planet that has been discovered, which is creating a speed and movement issue to our current solar system. The current solar system moves in directions that are respective to each other, The solar system containing Planet X is not really “orbiting”, the planet displaying move an unsteady wobble that could cause paths to be crossed with other planets in our solar system.