Jewel of the Orion Arm
The Earth has a diameter of 12,756 kilometers and a mass of 5.972e24 kilograms, being a moderately sized terrestrial planet. It possesses an axial tilt of around 23.5 degrees (roughly 0.41 radians), which is the primary cause for the seasons of Earth - as the planet orbits around its primary star, different hemispheres will face towards or away from the sun, creating differences in temperature and weather.
Earth is estimated to be around 4.5 to 4.6 billion years old, having formed approximately two thirds of the way to the present day since the formation of the universe. However, many of the rocks you will find on the planet are significantly younger; this is due to the processes of erosion and weathering occurring on the planet, destroying or burying older rock.
The energy of Earth is provided primarily by its primary star, the Sun, which is a standard yellow star, generating energy through the process of nuclear fusion, gaining and releasing energy produced from the formation of helium from two hydrogen atoms. It is the gravitational pull of this star that keeps Earth and its sister planets from wandering off into the boundless void, and this same gravitational pull pulls the planet in a revolution around the star, rotating in an elliptical orbit.
Furthermore, the Earth possesses one natural satellite of its own, often referred to as the "moon" by the humans inhabiting the planet, and this natural satellite is held to the planet by the planet's gravitational pull, completing its own revolutions around the Earth as the planet itself makes its way to complete a revolution around the sun. On average, twelve to thirteen lunar revolutions can be made in a single solar one.
Frequently Asked Questions
Q: What should I bring if I come to Earth?
Earth has a variety of climates, and it's nigh-impossible to combat all of the wrath nature can create on this planet. At polar regions, temperatures fall to low values, and so protection against cold temperatures is recommended. However, other regions of the Earth are burning hot and possess high temperatures. For the light-sensitive, exposure to direct sunlight may be unhealthy, and so protection against that is recommended, considering how there is typically at least twelve hours of daylight in a day.
Q: I don't understand. What is the difference between a "rotation" of Earth and a "revolution"?
A: The Earth naturally rotates around on its axis - this determines the day/night cycle of the planet. However, a rotation does not necessarily require the changing of the overall position of the object in space. As for a revolution, this is simply the movement of the planet around its primary.
Q: What life can I find on Earth?
A: Earth possesses a variety of lifeforms. The current dominant lifeform is the human, a bipedal species with the gift of intelligence, allowing it to develop technology to establish domination over the environment and the world. The human is a type of mammal, a creature with the capability of maintaining a constant body temperatures within itself, though there are other types of creatures as well: reptiles, amphibians, insects - these all make up a significant and highly important part of Earth's biosphere. Bacteria and other microbes dominate the unseen world of Earth, found in every corner, as proliferated and skilled at survival as the most fit species in the biosphere. Animals have even taken to the skies, evolving wings to fly high above the earth, and others too have adapted to survive in the great oceans of Earth, fish and algae thriving in water, with others having adapted to life deep beneath the surface, in the darkness of the depths. Every lifeform has preserved its bloodline, and every one seeks to do the same for endless generations, and this marvel of nature can truly be observed on Earth.
Q: What is the likelihood that I will die on Earth?
A: That phrase can be defined as the probability that a hypothetical tourist would suffer some form of deadly trauma and die while still on the planet Earth, typically presented as a numerical figure.
Q: Why is the Earth round?
A: What source did you get your information from? The Earth is most certainly not round. It is slightly larger at the equator than the poles, and thus it is not a perfectly round shape. It is an irregularly shaped ellipsoid. Get your facts straight before you ask questions like this.
Q: Why does the Earth look like it does?
A: The workings of the universe, obviously.
Q: Why have the workings of the universe made the Earth appear the way that it does?
A: An excellent question! The force of gravity seeks to pull things together, and to keep them held together, it must do so in the most efficient form possible: a sphere, where the force is equally distributed across a large area. When sufficient mass has been collected that the density has reached a point that the collected matter's gravitational pull is strong enough to overcome each object's resistance to the pull, a self-sufficient object, such as a planet, can form.
Q: What made the Solar System?
A: We do not understand the meaning of this question. As far as science has indicated, there was no "thing" that created the solar system Earth inhabits.
Q: What force made the Solar System?
A: Gravity, the weakest force.
Q: Why should I visit Earth?
A: Earth is a wonderful vacation spot, replete with life to observe, liquid water, and the marvels of nature's work, both created by the workings of the ecosystem and at the hands of the creatures that inhabit the world. Earth is truly a beautiful place to visit, and you should not miss out on this opportunity to see the cradle of humanity.
Q: Do I exist?
A: I don't know.
Credit for most images goes to their respective creators. Images used were obtained through image distribution site Pixabay.