Adaptive selling can be an expensive strategy to use in retail, and thus is typically found in more upscale stores.The higher level of personalization requires better-trained personnel who are more costly. selling strategy in which the way a product or service is presented varies according to the type of consumer viewing it.
The main tools used by astronomers are telescopes, spectrographs, spacecrafts, cameras, and computers. Astronomers use many different types of telescopes to observe objects in the Universe. Some are located right here on earth and some are sent into space. Just about everything we know about the Universe comes from the study of the light emitted by objects in space. Astronomers use these tools (especially telescopes) very often. Astronomers also use a lot of physics and mathematics in their work.
Most objects in space are so far away, that using a relatively small unit of distance, such as an astronomical unit, is not practical. Instead, astronomers measure distances to objects which are outside our solar system in light-years.