Here is another cool robot that you can use to explore harsh terrain. The Turtle Rover is a 4-wheel ground drone that can drive for 4 hours on battery. It has a mobile app that lets you control it from your phone or computer. Android, MacOS, and Linux are supported.
You can add robotic arms to do even more with your Turtle. The upper platform has 5kg load capacity. The robot is based on an open source platform with a Raspberry Pi 3 as its main computer.