Telescope
they learn by going to a good school and study the stars and planets
Scientists often look for the molecule water when investigating the possibility of life on other planets. Water is essential for all known forms of life and its presence can indicate the potential for habitability on other planets.
Studying the earth helps scientists to understand other planets since the earth is part of the solar system. Scientists use the features of the earth to compare them with what other planets hold.
scientists can't really find if there is life on other planets
By observing them regularly using telescopes and by sending orbital or lander probes to them.
They have sent a prob thingie to take pics about pluto. They do that to a lot of planets.
Because it could be sign of life.
Yes,Other planets could scientists believed some life were on other planets and signs of life
Scientists do not observe Mercury as often because it is difficult to do so.
Studying Earth allows scientists to understand fundamental planetary processes such as geology, atmosphere dynamics, and life forms. By extrapolating this knowledge to other planets, scientists can make comparisons and draw conclusions about similarities and differences, leading to a better understanding of the processes shaping those planets. Additionally, studying Earth helps scientists develop tools and techniques that can be used to analyze other planets from a distance.
They are sending robots to explore other planets where they conduct evperiment to see if the planet can support life.
....Well to beging with, we live on one. Other then that they just remain a mystery in Science that our scientists have explored but can continue to do so for quite some time and still learn new things.