Like with any stargazing, what you will be able to see will depend on where you are and specifically the level of light pollution where you are viewing but with 20x80 binoculars you should be able to see the moon in great detail, some of the planets of the solar system – including Jupiter and the rings of Saturn (these will be faint though), and some large galaxies and clusters – for example, M31, M33 and the Pleiades.