Assuming both Earth and Planet 2 established the same calender system, dividing up each day into 24 hour periods, and each started their respective calender on the same day, the new year for both planets would coincide every 100 years, disregarding leap-years or alterations to time keeping.
Applesauce squared.
It is assumed that somewhere, in the vastness of space, there may be another planet that can support life. Whether that life is one we would recognise is another matter.
That depends on the gravity at the surface of that planet. On the moon it would be 1/6 your weight on earth. On mars I think it is 1/3, on Jupiter it would be about 5000 times, though no ones checked that yet.
Not a planet of any significant size, which would be easy to see, but it is possible that some pieces of rock are in a similar orbit to the Earth at the five Lagrangian Points of the Earth's orbit.
EarthJupiterMars
The Earth is to the Moon as a planet is to its moon. So, if we're talking about a satellite orbiting a planet, then the planet would be analogous to the Earth, and the satellite would be analogous to the Moon.
when it wants to study another planet or come back to earth
yes, if the earth was in orbit around another planet, it would be a moon. However, it wouldn't "come into" orbit around another planet, that's pretty much impossible. a trajectory change like that would kill all life on earth anyway, so it's not something humans will ever witness.
I would search the planet. Observe it. Comare it from earth. Try to find aliens. Dance. Jump around. Breathe.
It's to do with the length of time a planet takes to spin, a planet that spins on its axis faster than the earth will have a shorter apparent day.
the same
Applesauce squared.
Yes, particularly if the discoverers were from another planet. Many would love to have been there.
It is assumed that somewhere, in the vastness of space, there may be another planet that can support life. Whether that life is one we would recognise is another matter.
Yes
it would break or if a small planet bumped itnto juipeter, juipeter would have another moon.
You could fit just under 18 of the planet mercury inside of the planet earth. Another way to say this would be: Mercury is 18 times smaller than earth.