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.
1 The most common tool is the reflecting telescope but with a detector sensitive to infrared wavelengths. Space telescopes are used at certain wavelengths where the atmosphere is opaque, or to eliminate noise (thermal radiation from the atmosphere).  Radio astronomy detects radiation of millimetre to decametre wavelength.