Earth is the only planet known to have life. Astronomers have found no other sign of extra terrestrial life.
There are 8 planets in our solar system. As of now, Earth is the only planet known to be inhabited by life.
If man developed on this planet first and only, then the Earth or Tellus is the only planet inhabited by man. It might be disputed if our planet is the first one or the only one. Science does not know for certain but the odds with to days knowledge are against theories of man coming to earth from other planets.
What is special about this planet is that it is the only planet with oxygen,water,and it is the only known planet known where people can live.Second known.
Humans, Homo sapiens, is a species that is known only to exist on the third planet from Sol, the sun. The third planet, Earth (sometimes technically designated "Sol 3"), is the most densely inhabited planet thought to be in our system.
Nobody truly knows !... Our understanding of life and our planet - is limited by the knowledge we have of our immediate surroundings. There is presently no way of knowing if or whether there are other inhabited planets out there in the rest of the Universe - and whether that life is 'intelligent'.
planet earth is known for being the only planet to support life
Earth
Earth is the only planet with known life... so far.
Earth is the only planet known to have life and liquid water.
Earth is the only known planet to have oceans of liquid water.
At present, Earth is the only such planet known.
earth is the only KNOWN planet with liquid H2O