Newton Crater is a large crater on Mars, with a diameter close to 186 mile (300 Km). It is located south of the planet's equator in the heavily cratered highlands of Terra Sirenum. The impact that formed Newton Crater likely occurred more than 3 billion years ago. The crater contains smaller craters within its basin and is particularly notable for numerous narrow channels that run from the top down to the crater floor and are presumed to be indicative of past liquid water flows. The crater was named in 1973 in honor of Sir Isaac Newton. Newton Crater viewed on Google Mars