Change is seen over the passing of time. Typically, we observe changes over periods of time that we can observe in our lives such as over seconds, minutes, hours, days, months, or years. These are timescales that we can observe using memory of our past. We recognize that time has existed on orders of magnitude beyond our personal observation from discussions of ancient and modern human history and we recognize that there was a vast time before humans and before life on Earth. This historical information is derived from a combination of writings, artifacts, fossils, geological evidence, and scientific principles. To look at the future of Earth's inhabitants, we will look at the past and then we can potentially make predictions for the near and distant future.