(Note: changed the question title, changed the expedition paragraph to mention weather stability (thx Christopher), voted to reopen, removed additional question section 20-jul)
(Note: some finds regarding the planet as viewed from Earth were possible because below scenario is situated about 150 years from now. There is no magic involved..)
(Note: near-zero means it could not be measured by the expedition on the planet, using 22th century equipment.. "near" was included for physics reasons, zero is impossible)
In 2173, a planet is discovered in the "goldy lock zone" of its solar system. Humans would be able to live there, and since we found the planet looking through a worm hole, we know we could send people over, in 1-4 years, depending on the location of earth relative to the entry point. When the entry of the worm hole is reached, we can jump in and warp travel to the planet in a few minutes. The worm hole is stable, so we could jump back as well, but that will be of no use, because with these worm holes, you never know in what epoch you'll arrive.. so it will be one way traffic, but we can get there !
This planet is very special. Thanks to its sun, the surface has a very nice temperature (15-22 celcius) and its atmosphere is earth-like, with similar levels of oxigen and nitrogen. It has water, clouds..
Very old and well protected planet
The worm hole folds most of the universe. This solar system containing the planet, resides about 7 billion light years away from us, the system is ancient. But this wonderful planet ! it's even older.. it did not originate from the solar system it was found in. The planet is estimated to be about 10.3 billion years old. And it has special properties: there is no hot mantle, no vulcanism and it has a stationary massive iron core, embedded in rock.. there seems to be no tectonic plate movement.. the planet's geology has stopped changing some 2-3 billion years ago. It is quiet: no asteroid belt near, despite the ancient surface, there are only very old craters on this planet. There are no radioactive crust elements in its spectrum.. every radioactive element that ever existed on the planet decayed to lighter elements, which are very stable, or have very long decay times. As a result of a relatively fast rotation, there is a magnetic field, which is a few times stronger than the Earth magnetic field. This field does not affect life on the surface in any way, but it forms a perfect shield against cosmic rays. Any molecular oxigen rising in the atmosphere is captured by the magnetosphere and turned into ozone, resulting in a thick ozone layer as well, protecting the surface from harmful UV light from the sun.
The above was all known from observation, before the first expedition left. They took a small quantum device with them, keeping Majorana particles entangled with Majorana particles on earth. This way, the researchers could communicate their findings. Slowly, but instantly.
In short.. the expedition found weather to be extremely stable, and also, the flora and fauna on this planet to have existed for a very long time, remaining unchanged. The first paleo-biologists investigating the planet found sedimentary layers several hundreds of million years old, containing exactly the same species they found alive. As the expedition was quite short, as a result of a poisoning accident, biologists could not validate their theory, that the stationary ecosystem was caused by a combination of low radiation, stable climate and absent tectonics.. but it seemed plausible ! In a sense, evolution was frozen in time.
Thanks for all help and comments.