An object's motion can be described by tracing and measuring its position over time. The sun, moon, stars, clouds, birds, and airplanes all have properties, locations, and movements that can be observed and described. The moon moves across the sky on a daily basis much like the sun. The observable shape of the moon changes from day to day in a cycle that lasts about a month.
Science is one way of answering questions and explaining the natural world.
Women and men of all ages, backgrounds, and groups engage in a variety of scientific and technological work. Tools help scientists make better observations, measurements, and equipment for investigations. They help scientists see, measure, and do things that they could not otherwise see, measure, and do.