on planet earth
Besides Earth? Saturn.
Cosmology is the study of the universe as a whole (as compared to our particular corner of the universe, the planet Earth, which we naturally have studied very closely). Cosmology is concerned with such questions as, how was the universe created and what is its past history, how big is it, what does it contain, how does it evolve, what will it be like in the future.
If it's any planet other than Earth, always capitalize it. If you're talking about the planet Earth in an astronomical context, or in any other context where you feel a need to clarify you are specifically talking about Earth and not some other planet, capitalize it. For example: "Temperatures on Earth range from -89°C to 57°C." If you're using the word 'earth' in more of a casual, day-to-day sense, don't capitalize it. For example: "The tree branch broke off in the wind and fell to the earth with a thud."
Time on Earth began approximately 4.5 billion years ago, with the formation of the planet.
Earth does.
Not compared to earth!
The earth has very unique weather when compared to other planets. It is the only planet that experiences the four different seasons due to the planetÕs tilt. The planet earth is the only planet to experience temperate climates.
The tilt of the earth causes different day lengths.
It takes one year to complete one revolution around the sun. This is the definition of a year. All planets take one (local) year to do so. Years are of different lengths of time depending on what planet you are referring to. A year on earth is different from a year on a different planet
In size and mass it is enormous compared to it's parent planet - The Earth.
Long before. By the ancient Greeks, who compared the lengths of shadows of a stick at different latitudes on the same date.
It is about three times larger than planet Earth.
It is about three times larger than planet Earth.
0.2408 of an Earth year.
Venus is often compared as Earth's "sister planet", being similar in size and internal composition.
I think venus