why is the earth a unique planet
Answers
Earth is a unique planet because in no other planet can we find water and life.But in earth we find both water and life.
Earth is extremely unique.
Earth has many things going for it, that other planets just don’t have. For one, it has large amounts of liquid water. This might not be too special, as Jupiter’s moon Europa also may have liquid water, but it is not certain. Other than maybe Europa, Earth is the only planet that currently has liquid water (planets like Mars used to have water). Also, Earth has a substantial amount of oxygen that allows it to support life, and it has the perfect amount for fires to burn. If there was too much oxygen, everyone would die of oxygen toxicity, and fires would burn like crazy.
So, Earth has already defied all odds and has liquid water and enough oxygen to support life (but not too much). Lets see what else Earth has to offer…
Earth has a thick atmosphere, which grants protection to Earth’s residents from harmful UV rays from the sun. It also is the perfect density that it doesn’t crush people, but it isn’t too thin so it allows people to breathe. Also, Earth has a powerful magnetic field that protects it from harmful solar wind and solar flares. The reason Mars is such a barren wasteland with a very thin atmosphere is because it doesn’t have a very strong magnetic field; over time, the Sun blew away its atmosphere. The magnetic field on Earth deflects most solar wind and solar flares, but some wind can get through and interact with the particles in the atmosphere. This is what creates Aurora Borealis, or the Northern lights.
Earth also is a good size to support life. If it was much smaller, it would lose its atmosphere like Mars or Mercury. An interesting aside: Earth is in fact quite small for a planet able to support life; slightly larger planets would actually be more likely to be habitable than ones of Earth’s size. That’s why astronomers often look for exoplanets larger than Earth, because they would more likely be able to support life.
Finally, Earth is the perfect distance from the sun. It is located in an area called the Goldilocks Zone, which is the distance from a star where liquid water is able to be sustained. If Earth were farther away, it would be too cold, and all the water would freeze, like the poles on Mars. If Earth were closer, the water would be boiled off.
In conclusion, Earth is unique because against all odds it manages to be the perfect distance from a star, it is a good size, it has a thick atmosphere, a strong magnetic field, an oxygen rich atmosphere, and it has large amounts of liquid water. All these factors combined allow Earth to be the only planet (that we know of) that is able to support complex life.
It’s in a solar system with irregularly spaced planets, something that doesn’t seem to be all that common
Not only that, the planets in its system have very different sizes - which also seems to be unusual
Earth is - so far - the only world known to have solid, liquid, and gaseous water on its surface
Earth’s moon is enormous, especially for such a small planet
Not only that, but the Moon’s diameter is only about 1/4 the diameter of the Earth - that’s the second closest ratio of planet size to moon size known
Earth has a very strong magnetic field for such a small planet
Earth has active plate tectonics - the only world currently known to have those
Earth is the only known world with an oxygen-rich atmosphere
Earth is one of only three worlds known to have dunes on its surface
Of course, the Earth is the only known world that currently has life
Because of that, the Earth is a ridiculously strong radio source - in fact there are parts of the radio spectrum where the Earth is brighter than the Sun
Granted, I wouldn’t want to live anywhere else, but we’re stuck on a strange little ball of rock hurtling through space. Of course, it remains to be seen just how unusual these things are, given that the study of exoplanets is still in its infancy.
Source:Quora.