It was only a matter of time finding basic lifeforms, i expect they will find some on Mars also. Scientists think there is an ocean beneath the icy surface of Jupiter’s moon Europa, that ice shell is 15 to 25 kilometers (10 to 15 miles) thick, floating on an ocean 60 to 150 kilometers deep (40 to 100 miles). While Europa is only one fourth the diameter of Earth, its ocean may contain twice as much water as all of Earth’s oceans combined. Europa’s vast deep ocean is widely considered the most promising place to look for life beyond Earth. A closed ecosystem untouched for millions of years.

Our Milky Way Galaxy contains 400 billion stars with 7% of them being G-type. That means less than 6 billion stars may have 10 billion Earth like worlds of which could be in their stars habitable zones. That's a lot of planets to discover with potental life. Of course we don't have the tech to get there but alien life exist just because of the sheer numbers. It depens on which stage of evolution they are from plankton to intelligent species like a type 1/2/3 civilizations. The Milky Way is just 1 of trillions out there.

Earth is a young planet while human DNA dates back to 1 million years. The entire human life spawn is just a blink of an eye in Earth's time frame.

Ancient modern history dates back to ancient Greece? Mhe... when great Greek cholars like Thales, Hippocrates, Pythagoras, Socrates, Plato and Aristotle arrived in Egypt the great pyramids of Egypt where already ancient.

We lived for hundreds of thousands of years as cavemen but just a few thousands of years modern humans appeared and has developed on a blistering speed, how is that even possible? What happend to other civilizations like the one who cunstructed the pyramids ore the other megalithic structures in South-America? A civilization on top of another civilization i guess. I love history it gets really crazy the more i search.