Our understanding and our modern perception of our solar system, the Milky Way, has been drastically reshaped from the corresponding perception of only a few hundred years ago. Our Solar System, the Milky Way is probably about 4-5 billion years old. Only in the last 400 years or so have we realized that the earth is not the "center", and that in the Universe alone there is an immense 200 billion "Suns" in a galaxy like our …showed first 75 words of 2341 total…

…showed last 75 words of 2341 total…Planets and moons are not the only part of the solar system. Today there is still many parts of the solar system we are unaware of or even unsure of. Some astronomers theorize about a planet X, or even a sister star to the Sun. There are many disturbances in space and a planet X or a sister stars could possible answer the questions astronomers have about the solar system and the planets around us.