There is no scientific evidence to suggest that Earth has been explored by other life forms from beyond our planet. The search for extraterrestrial life continues, but no confirmed contact or exploration has occurred.
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The largest unexplored area on earth is thought to be the deep ocean, specifically the ocean floor. Less than 5% of the world's oceans have been explored, leaving much of this vast underwater world a mystery to us.
Expeditions to space have allowed humanity to explore Earth from above, but in terms of direct, thorough exploration on the ground, there is no definitive count. Geographical regions, both remote and populated, have been studied to varying degrees. Continuous research and exploration activities mean Earth is an ongoing subject of discovery.
The most primitive life on Earth are single-celled organisms such as bacteria and archaea. These organisms have simple cell structures and are thought to have been some of the first life forms to appear on Earth billions of years ago.
Trivia Jellyfish have been on Earth for over 650 million years, before sharks and dinosaurs. The Earth is about 4.5 billion years old A galactic year is 250 million Earth-years If you were standing on Mercury, the Sun would appear 2.5 times larger than it appears from Earth Aluminum forms one-twelfth of the Earth's crust.
Approximately 0.01% of Earth's total lifetime has been habitable for complex life due to various factors like temperature, water availability, and atmospheric conditions. This habitable window has allowed life to flourish and evolve into the diverse forms we see today.