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answers:
swbarnes2 say: Dinosaurs are the product of a long process of evolution; billions of years of random mutations shaped by the environment.
Sure, something similar looking could evolve somewhere else, but they wouldn't really be Earth dinosaurs.
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Cal King say: Certainly. That is one possibility. However, those "dinosaurs", if they indeed exist, are not related at all to any life form on earth. in fact, a fish, a jellyfish, a worm, a plant, a mushroom and a bacterium would be more closely related to dinosaurs on earth than the outer space dinosaur would be to the dinosaurs here on earth. Convergent evolution means two different life forms have evolved independently to resemble one another.
Since form follows function, it is indeed possible for something similar to dinosaurs to have evolved on another planet. Some remarkable examples of convergent evolution on earth include the thylacine and the wolf, and some theropod dinosaurs and the ostrich. In fact, some scientists thought that the ostrich evolved directly from a theropod dinosaur without having a flying ancestor. Recent DNA data suggests that ostriches evolved from a flying paleognath closely related to the tinamous of South America. Another example of convergent evolution is falcons and hawks. Turns out falcons are most closely related to parrots but hawks are more closely related to water birds and owls than to falcons.
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Satan Claws say: Regarding TRAPPIST-1, this is what was really found:
http://www.nature.com/nature/journal/v54...
You will notice that there are no photographs of planets, let alone signs of life. So don't put the oxcart in front of the oxen.
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Choose a bloody best answer. It's not hard. say: Not only do you need the same conditions, but the _same_ random genetic mutations that are then continued by natural selection. Astronomical doesn't begin to describe it.