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We don't know that it is.
While it certainly seems as if Earth is the only inhabited planet in the solar system, we cannot be entirely certain of this, for two reasons:
1. We're looking for life as we know it, and alien life may be very different.
2. We haven't looked very much: A half-dozen landers on Mars, only one on Venus (and it only lasted for an hour!), and one on one of Saturn's moons. We have hardly looked at all at Jupiter's moons, and Europa could easily have life in its oceans beneath the ice. Our Moon certainly seems lifeless, but again, we've only landed there a few times, and for only a few days each time.
Earth is the only inhabited planet in our solar system primarily due to its location in the habitable zone, presence of liquid water, and suitable atmosphere for life as we know it. Other planets in our solar system are either too hot, too cold, lack liquid water, or have toxic atmospheres that make them inhospitable to life.
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How many planets are and are they inhabited?
There are 8 planets in our solar system. As of now, Earth is the only planet known to be inhabited by life.
Which third planet is closest to the sun?
Earth is the third planet from the sun in our solar system.
What planet in the solar system is the largest rocky planet?
The Earth.
Which planet in the solar system would come third alphabetically?
Earth would be the third planet in the solar system alphabetically, after Earth and Jupiter.
What is the further planet from the earth?
The farthest planet from Earth in our solar system is Neptune. Neptune is the eighth and final planet in our solar system, located about 2.8 billion miles away from Earth at its farthest point.
How many planets are and are they inhabited?
There are 8 planets in our solar system. As of now, Earth is the only planet known to be inhabited by life.
What is earth in the solar system?
Earth is a planet in the solar system
What kind of solar system is earth?
Earth is a planet, not a solar system.
What was the earth?
The Earth is a planet in our solar system and the third planet from the sun. The Earth is the only planet within our solar system that can support life.
Is the earth is the largest planet in solar system?
The largest planet in the solar system is Jupiter.
Which third planet is closest to the sun?
Earth is the third planet from the sun in our solar system.
Is Earth the second largest or the third largest planet in our solar system?
No, Earth is the fifth largest planet in our solar system.
Is earth the second smallest planet in the solar system?
No,Mars is. Earth is the fourth smallest planet known in the solar system.
Why is earth the largest planet in the solar system?
It isn't. Earth ranks 5th in size. Jupiter is the largest planet in the solar system.
Why is earth is a unique planet in our solar system?
Up to now, Earth is the only planet in our solar system that can sustain life as we know it.
What is the most humid planet in the solar system?
In the Solar System the answer is Earth since it is the only planet that has water.
What is the average destiny of planets?
Because earth is the only inhabited planet in our solar system, all but earth will no doubt remain the same. The destiny of this earth on which we live is to be celestialized at a time when its period as an earth as we know will have finished.
