there has been no definitive proof of extraterrestrial life discovered by humans. However, the possibility of extraterrestrial life is a topic of active scientific research and speculation.
The universe is vast, with billions of galaxies each containing billions of stars. Many of these stars likely have planets in their habitable zones, where conditions might be right for life as we understand it to exist. Moreover, life as we don't understand it could exist under other conditions.
Astrobiology is a scientific field dedicated to the study of the origin, evolution, and distribution of life in the universe. This field involves the study of the conditions on other planets and moons in our own solar system, such as Mars and the moons of Jupiter and Saturn, that could potentially harbor life. It also involves the search for exoplanets in the habitable zones of their stars, and the search for extraterrestrial intelligence (SETI) which looks for signs of intelligent life elsewhere in the universe.
There are several promising places in our own solar system where life might exist, such as under the icy crust of Jupiter's moon Europa, which is believed to have a global ocean of liquid water. Or on Saturn's moon Titan, which has lakes and rivers of liquid hydrocarbons, offering a different chemistry that might support life.
With all this in mind, many scientists consider it plausible that life exists somewhere else in the universe. However, we have no definitive proof yet, and the search continues.