Mars is being explored through a combination of robotic missions and satellite observations. NASA's Perseverance rover is currently on the surface of Mars, conducting experiments and collecting samples to study the planet's geology and potential for past life. The rover is also testing technologies for future human missions to Mars. In addition, several orbiters, such as NASA's Mars Reconnaissance Orbiter and the European Space Agency's Mars Express, are continuously studying the planet from above, providing valuable data on its atmosphere, surface features, and climate. **

While much of the Earth has been explored, there are still many remote and inaccessible areas that remain unexplored. These include deep ocean trenches, dense rainforests, and polar regions. Additionally, new discoveries are constantly being made, such as previously unknown species or archaeological sites. So, it is safe to say that not every spot on Earth has been fully explored. **

It is difficult to determine an exact percentage of the Earth that has been explored, as exploration can be defined in various ways. However, it is estimated that less than 5% of the world's oceans have been explored, leaving the majority of the Earth's underwater environments uncharted. In terms of land exploration, much of the Earth's surface has been physically visited and studied, but there are still remote and inaccessible regions that have not been thoroughly explored. Overall, the percentage of the Earth that has been fully explored is likely quite small. **

The deep sea is still largely unexplored, with only a small fraction of it having been thoroughly studied. The extreme depths, high pressures, and darkness of the deep sea make it a challenging environment to explore. As a result, there are still many unknown species, habitats, and ecosystems waiting to be discovered in the deep sea. Advances in technology, such as remotely operated vehicles (ROVs) and autonomous underwater vehicles (AUVs), have allowed scientists to explore deeper into the ocean than ever before, but there is still much more to learn about this mysterious and fascinating environment. **

It is estimated that less than 5% of the Earth's oceans have been explored, leaving the vast majority of the underwater world still unknown. When it comes to land exploration, the percentage is slightly higher, with around 20% of the Earth's land surface considered to be unexplored or undiscovered. Overall, it is safe to say that a significant portion of our planet remains unexplored and holds many mysteries yet to be uncovered. **

Outer space is less explored compared to the ocean. While there have been numerous space missions and telescopes that have provided valuable information about our universe, there is still much of outer space that remains unexplored. On the other hand, the ocean covers more than 70% of the Earth's surface and is constantly being studied and explored by scientists and researchers, leading to a better understanding of its depths and ecosystems. **

While much of the Earth has been explored, there are still many remote and inaccessible areas that have not been fully explored. These include deep ocean trenches, dense rainforests, and polar regions. Additionally, new discoveries are still being made in terms of species, ecosystems, and geological features. So, while significant progress has been made in exploring the Earth, there are still many uncharted territories waiting to be discovered. **

While much of the earth has been explored, there are still remote and inaccessible areas that have not been fully explored. These include deep ocean trenches, dense rainforests, and polar regions. Advances in technology continue to help us discover new places and species, but there are still many mysteries left to uncover on our planet. **