Because Earth is the only place where we can murder the English language and ask questions like, "Why life is possible only in earth not in other planets?"
Earth's scientist have not found life on other planets to date.
Three things that make life on Earth possible are; water, temperature, and the atmosphere.
Yes, only on the Earth. We don't know if the other planets have life
Astronomers have found Earth-sized planets in other solar systems.
There is life on other planets. Imagine, there are 1000 planets in the Universe for every grain of sand on the earth. That's how many planets there are, so scientifically, the chance that there must be life on other planets as well is much greater than the chance that there is no life.
the planets containing life form other than earth may have a dangerous species, or the planet itself may be dangerous.
Other planets do not have water nor life
Fortunately for the other planets, Earth is the only one.
earth has air , water and life.
No, there is no oxygen on any other planet other than Earth because there is no planet life on the other planets.
Yes, it is possible that there are other Earth-like planets in the universe. Scientists have discovered thousands of exoplanets, some of which are in the habitable zone of their star where conditions might support life as we know it. Future missions and advancements in technology may help us identify more Earth-like planets.
We don't know about any other other place, besides Earth, that harbors life. But many scientists think that there is life on other planets.