The conditions required for life as we know it on Earth are very specific, such as the presence of liquid water, a stable atmosphere, and a mix of essential elements. Other planets may have different environments that would not support life as we know it. Additionally, the vastness of space and the limited number of planets we have been able to study make finding similar organisms unlikely.
Archaebacteria
We cannot know for certain since no probe from earth has ever done more than fly by. However, if there is life it is unlikely to be life similar to life found on Earth.
Mars
Mars
A planet called Kepler 186f, in the constellation Cygnus, is the same size as the Earth and it is similar to Earth in looking to. Venus is only slightly smaller than Earth and is the closest in size to it in our solar system.
Archaebacteria
We cannot know for certain since no probe from earth has ever done more than fly by. However, if there is life it is unlikely to be life similar to life found on Earth.
Venus is often compared as Earth's "sister planet", being similar in size and internal composition.
Mars
Venus.
Mars
Mars
At present, Earth is the only such planet known.
Probably. Astronomers estimated that there are at least 100 billion planets in the galaxy, a good number of which may be similar to Earth. It seems pretty unlikely that Earth would be the only planet to develop life.
The planet similar in size to Earth is Mars.
A planet called Kepler 186f, in the constellation Cygnus, is the same size as the Earth and it is similar to Earth in looking to. Venus is only slightly smaller than Earth and is the closest in size to it in our solar system.
Possibly but unlikely to be the same as Earth. How precise do you want to be - continent's, mountains and oceans - impossible.