They're not. There's no real scientific consensus, but most scientists agree that given the immensity of the universe, it's almost arrogant to assume we are the only denizens inside of it.
If you're still interested, look up the Drake Equation on Wikipedia, or watch this video of Carl Sagan explaining it: [See related link]
It's unlikely because only Earth can support life because Earth isn't too hot/cold, our atmosphere allows us the breathe, and we have liquid water instead of ice or water vapor; other planets don't have these.
because there is not that much land and countryside there, its just mostly water
Planets that are not part of our solar system and in other solace systems are called exo-solar planets or exoplanets.
Other planets other than earth is put in the solar system for humans to explore and do researches on them.
Name the planets that do not exist in the solar system
It is highly unlikely that any other planet in our solar system will. That does not preclude the possibility of life being elsewhere in the universe.
Jupiter has more mass than all the other planets (in the Solar System) together.Jupiter has more mass than all the other planets (in the Solar System) together.Jupiter has more mass than all the other planets (in the Solar System) together.Jupiter has more mass than all the other planets (in the Solar System) together.
Planets that are not part of our solar system and in other solace systems are called exo-solar planets or exoplanets.
Other planets other than earth is put in the solar system for humans to explore and do researches on them.
It is very unlikely there are unknown planets in our system,, although beyond the kuiper belt, at the very far edge of our solar system some believe there may be another planet. It is referred to as "Planet X".
Name the planets that do not exist in the solar system
It is highly unlikely that any other planet in our solar system will. That does not preclude the possibility of life being elsewhere in the universe.
Jupiter has more mass than all the other planets (in the Solar System) together.Jupiter has more mass than all the other planets (in the Solar System) together.Jupiter has more mass than all the other planets (in the Solar System) together.Jupiter has more mass than all the other planets (in the Solar System) together.
ALL OF THeM!! But seriously: We know of no planet except Earth with life on it in our solar system, and the conditions on other planets forbid advanced life. There are planets belonging to other suns, but they are very far away, and we have no information about life on them. It is extremely unlikely, but not impossible, that aliens from other solar systems have visited our solar system.
They could, but as of now, no astronauts have travelled to any other planets in the solar system.
The atom and the solar system are not equal. The solar system contains the sun and the other planets.
many things could damage planets in our solar system, there could be the explosin of our sun, lage metiorites ,exterestrial invasions(unlikely), we are damaging our planet and it wont last forever
9 P in the S S = 9 Planets in the Solar System