Is it exobiology
Nova - 1974 Finding Life Beyond Earth - 39.3 was released on: USA: 19 October 2011
Maybe there was but no one knows for sure in the same way that no one knows for sure if there is life beyond planet Earth.
Currently, we don't know. So far we have never found any direct evidence of life beyond Earth. But, given the incomprehensibly large number of planets in the universe, many people think there probably is life elsewhere.
It is important in case there is life beyond Earth.
Astrobiology and exobiology are fields of science that include the search for life beyond Earth, and the possible effects of extraterrestrial environments on living things. There has been no confirmed evidence of life existing beyond the Earth as of 2013.
There is no life on Mercury that we know of however, we do not know exactly because we can not get close enough to examine the planet.
A life on another planet
Yes. You live on earth. If there was no life on earth, you wouldn't exist
There is no evidence to say weather or not we will find alien life in 2025 or at any time in the future, let alone set a date. It is still unknown if life exists beyond Earth, or how common it is if it does exist.
The Earth has not been invaded. Any invasion of Earth would have to be from beyond Earth, and would therefore be from space.
Are you on Earth? Are you alive? If you can answer those questions, and do a little simple logic you will realize that, yes, there is life on Earth.