I believe that mars was once like earth and we had to leave to get away from destruction and that's why there is no proof of how the world was made.
When we left mars the government made all evidence go away.
i also believe that in the next 20 years we will be back on mars.

Okay One I Hate Young Thug, But This Is The Only Thing I Could Think Of When I Saw Your Post.

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I believe there are many galaxies and planets exactly like ours. I believe there are people just like us, maybe a bit more advanced, or maybe even less advanced. The galaxy is huge let alone all the galaxies out there.

There actually could be, depending on two different things.

1. There are only a certain number of structures which can be formed by atoms, it's a huge number, but there is still a limit. Eventually, the further and further you go out into space, you could, theoretically, start seeing structures you have seen before. Including Earth.

2. If there is a Multiverse there would be not just one more Earth, but an infinite amount of other Earth's.
Each either being exactly the same as this Earth, slightly different, or insanely different, depending on the laws and happenings of the Universe it is in.

I honestly think there really could be another planet somewhat like earth..

It depends on what you're talking about in all honesty. If you are talking Earth like the planet we live on.. Then yes, of course. I say this because there is so much space out there in the Universe and the amount exoplanets is large, so for that I'm going to say yes a strong chance.

But where as for Earth and humans.. I'm going to say no. Because these other 'humans' would have to adapt to a severely different environment and they'd be exposed to different variables than we would for example we have Ozone Layer. They might not have an Ozone layer so they might have lighter skin than us to not absorb so much heat from the UV, if that makes sense because the darker the skin colour the more heat you will obtain.

I am almost certain there are a lot like earth , knowing how big life is . How big galaxies are , how many galaxies there are . Definitely

I'm sure there are but just not another one in our galaxy, there is so much of space that we have not explored yet.

I believe that in every galaxy there is another planet that has life forms in it but it is impossible to know