area 51
some where in government labs.
Genghis Khan and his hordes of Mongols were almost unstoppable.The hordes of invaders just kept coming.The illegal immigrants darted across the border in hordes.
people and dinosaurs never co-existed
Dragons have never existed and are not real.
The earth would be too cold for life. Greenhouse gases have been essential for life on this planet, and have kept Earth warm for millions of years.
The Cherokee tribe has not kept the kind of records which would allow us to know with confidence how long they have existed, but anthropological evidence would suggest that 30,000 years is a reasonable approximation.
The universe is huge and constantly expanding, and so, many things are happening all at once, so maybe a species just went extinct somewhere, a star exploded, or something else. It is hard to say if there are aliens or we are truly alone. There are many theories, and researches going on about this so if you'd like you can go read a few and get more thoughts on this topic, because until there is a definite answer all we have are theories, unfortunately.
Gravity.
It is kept in orbit by Earth's gravity.
i don't know how long corydoras have existed, but they can live an average of 5 to ten years. however some people have kept theirs' for12.
The earth's gravitational pull.
the sun
Gravity