Mars
They are not. People from earth are not fictional.
A billiard ball.
Mars
The rotation of Mars is very similar to the rotation of earth. Its axial tilt, the length of its day, and the direction of its rotation are all very similar to those of earth.
It is similar
No. Mars has about one tenth of Earth's mass. Venus, howevr, does have a similar mass to Earth.
Neptune's axial tilt is similar to Earth's, causing it to have seasons!
Mars is the only planet that has four similar seasons to Earth's.
You'd need an atmosphere similar to that of Earth's, a source of water similar to that of Earth's and land masses that have the ability to grow food on them, similar to that of Earth's. Basically, you'd need Earth.
Mars is very similar to Earth. Mars' year and day are very similar to Earth compared to other planets.
The gravity on Venus is very similar to the gravity on Earth. The density of Venus is also very similar to Earth's.
No planets are similar but there is a moon. Titan, one of Jupiter's moons, is very similar to Earth.
no
Inner planets are rock with minerals similar to those on Earth
The odds that a world similar to earth would have the same languages as earth are so minuscule as to be almost negligible.
Venus is often compared as Earth's "sister planet", being similar in size and internal composition.