Nobody knows. There is no evidence of it, so far.
Extraterrestrial life is defined as life that does not originate from Earth. Life on other planets is a simpler way to word it. Aliens on other planets is an example (but I doubt aliens live on other planets) of extraterrestrial life. Also, bacteria are another example. There is proof that there was once water on Mars, and that there may have been bacteria living in that water. That bacteria would also be considered as extraterrestrial.
Yes there is small bacteria on other planets which will eventually evolve over millions of years and turn to animals and then maybe some kind of human
All animals need water, that is why it is so hard to find life on other planets. However some bacteria on the other hand do no need water to survive.
There is LIFE on other planets but not like super advanced green guys with black beady eyes. It is simply forms of bacteria that can grow in harsh environments.
Yes.
The other planets are not similar to dwarf planets.
The other planets do have gravity.
The other two planets are Mercury and Venus.
no thunder does not appear in other planets
yes we can live
No, other planets are rotating at other speeds.
There are many other planets in many other galaxies.