It's a bit of a trick question! Satellites and robots *orbit* Earth, but they don't technically "explore" it in the way we think of exploration. They're tools for observing and gathering data about the planet, not physically walking around and discovering new things.

Here's a breakdown:

* Satellites: The first artificial satellite, Sputnik 1, was launched by the Soviet Union in 1957. Since then, countless satellites have been launched, carrying instruments to monitor weather, map the Earth's surface, track natural disasters, and study the atmosphere and oceans.

* Robots: While robots haven't physically walked around on Earth, they have been used in remote environments for various purposes. For example, rovers have been used to explore Mars and other planets, but not Earth itself.

So, while satellites and robots haven't explored Earth in the traditional sense, they've revolutionized our understanding of the planet. They've provided us with valuable data about Earth's climate, geology, ecosystems, and more.