The other day I was wondering how one would describe Earth to an alien or a classroom of our modern-day interconnects kids.
Where would one start.
Is it round? Not quite it is an oblate spheroid instead of a perfect sphere. It takes the Earth on solar day to rotate upon its axis.
An alien might come to earth and attempt to understand the planet by reading the literature of the planet, or just the dictionary. Looking up the word “earth” the alien may be surprised to see the this term has multiple meanings, referring to a planet and to a substance (soil/dirt).
May be the best place to start is to give an perspective of where we are in space.
As you look outward into space, you’re actually looking backwards in time. The light you see from your computer is nanoseconds old. The light reflected from the surface of the Moon takes only a second to reach Earth. The Sun is more than 8 light-minutes away. And so, if the light from the nearest star (Alpha Centauri) takes more than 4 years to reach us, we’re seeing that star 4 years in the past. There are galaxies millions of light-years away, which means the light we’re seeing left the surface of those stars millions of years ago. For example, the galaxy M109 is located about 83.5 million light-years away.
A radio signal to travel once around Earth in 1/7 of a second. To get to the moon from Earth, so the round-trip time is twice this or 2.46.
From the sun to earth at the speed of light seconds.https://youtu.be/Bw-I9JimhOM
If aliens lived in those galaxies, and had strong enough telescopes, they would see the Earth as it looked in the past. They might even see dinosaurs walking on the surface.
Only a few of us have ever seen Earth from afar. It’s mankind’s rarest view of all.
To see it without borders, see it without any differences in race or religion, we would all have a completely different perspective. Because when you see it from space you cannot think of your home or your country. All you can see is one Earth….”Earth, our home planet.
It is a beautiful blue and white ball when seen from space. the only planet in our solar system known to harbor life.
All of the things we need to survive are provided under a thin layer of atmosphere that separates us from the uninhabitable void of space.
HERE IS HOW I WOULD DESCRIBE IT;
It was formed about 4.5 billion years ago.
Earth is made up of complex, interactive systems that are often unpredictable. Air, water, land, and life—including humans—combine forces to create a constantly changing world that we are striving to understand.
It is the third planet from the sun and the fifth largest in the solar system.
About 71% of its surface is covered by water; the rest by land.
It is orbited by one satellite, the Moon.
Earth’s total surface area is 196,950,000 sq. mi. The area covered by the oceans is 139,480,000 sq. mi. Total land area is 57,470,000 sq. mi.
Earth’s diameter is just a few hundred kilometers larger than that of Venus.
The Earth’s crust is about 6.5 miles thick beneath the oceans, and about 25 miles thick under the continents.
Our planet’s rapid spin and molten nickel-iron core give rise to a magnetic field, which the solar wind distorts into a teardrop shape. The magnetic field does not fade off into space, but has definite boundaries.
Our planet completes its elliptical orbit around the sun in an average solar year, 365.24219 days. Its average distance from the sun is 80,777,537.8 n.mi.
The Earth’s axis is tilted 23.45 deg away from the perpendicular to its orbital plane.
It wobbles very slightly.
The Moon orbits the Earth about once a month (every 29 days, 12 hours, 44 minutes, 2.9 seconds) The average distance from the Earth to the Moon is 238,857 mi., about 30 times Earth’s diameter.
The Earth’s crust is about 6.5 miles thick beneath the oceans, and about 25 miles thick under the continents. The surface layer is made of rock. This outer layer formed a hard, rocky crust as lava at the surface cooled 4.5 billion years ago.The crust is broken into many large plates that move slowly relative to each other. Mountain ranges form when two plates collide. The plates move about one inch per year. About 250 million years ago, most of the land was connected together, and over time has separated into seven continents. So millions of years ago the continents and the oceans were in different positions.
Scientists had previously concluded that the Earth was slightly older than 4.5 billion years old, but had not found a piece of the Earth’s primitive mantle.
The solid shell that is between the Earth’s crust and the outer core makes up about 84 percent of the Earth’s volume. Until recently, researchers generally thought that the Earth and the other planets of the solar system were chondritic. This means that the mantle’s chemistry was thought to be similar to that of chondrites, some of the oldest, most primitive objects in the solar system. Chondrites contain certain isotope ratios of the chemical elements of helium, lead and neodymium.
Sixty-five million years ago it looked quite different than it does to-day.
There are about 300,000 plant species and about 1,400,000 animal species on Earth.
In the next 6.4 billions of years it will be eating by it nearest star the Sun which is 149,597,891 kilometers away. It will take a little more than 8 minutes before we realized it is time to put on a sweater. It takes Sunlight an average of 8 minutes and 20 seconds to travel from the Sun to the Earth.
It weighs 5.9736×1024kg. That is about 13,170,000,000,000,000,000,000,000 pounds (or 5,974,000,000,000,000,000,000,000 kilograms).
80% of its fresh water is in its polar ice caps. Fresh water exists in the liquid phase only within a narrow temperature span (32 to 212 degrees Fahrenheit/ 0 to 100 degrees Celsius). The surface is unique from the other planets because it is the only one which has liquid water in such large quantities.
Its greatest present day threats come from humanity which is at a crossroads now, where we have to make an active choice.
Evolution, the Big Bang, and climate change are all things that were first proposed as hypotheses long ago.
Climate change is not. What are we doing about it. The same as always. Turn it into a product for profit.
One choice is to acknowledge these issues and potential consequences and try to guide the future (in a way we want to). The other choice is just to throw up our hands and say, ‘Let’s just go on as usual and see what happens.’ My guess is, if we take that latter choice, yes, humanity is going to survive, but we are going to see some effects that will seriously degrade the quality of life for our children and grandchildren.
The ongoing wars, the distortions of truth we have witnessed, the widening gaps between rich and poor disturb us more than we can say; but we have had so many reminders of powerlessness that we have retreated before the challenge of bringing such issues into our classrooms of our brains.
The best effort so far is the creation of an Earth Day this year. One day!
Population growth, widespread destruction of natural ecosystems, and climate change may be driving Earth toward an irreversible change in the biosphere, a planet-wide tipping point that would have destructive consequences absent adequate preparation and mitigation. No one knows how close Earth is to a global tipping point, or if it is inevitable.
Life on Earth is constantly changing and only the fittest organisms survive.
Every few of us appreciate how thin our little atmosphere is that supports all life here on Earth. So if we foul it up, there’s no coming back from something like that. The dictionary offers a firm set of definitions for this term, but no single definition, which leads to a sense of complexity. The complexities of perception are, in part, what post-modernism is all about. I describe it as pure insanity.
The Earth system now includes human society, Our social and economic systems are now embedded within the Earth system. In many cases, the human systems are now the main drivers of change in the Earth system. Earth system changes, natural or driven by humans, can have significant consequences without involving changes in climate. Global change should not be confused with climate change; it is significantly more. indeed, climate change is part of this much larger challenge.
Throughout history human societies have had to confront and adjust to climatic and environmental hazards. A long-term perspective that draws on such experiences must inform today’s climate policies. I argue that climate policies aimed at mitigating and adapting to hazards should be informed by our knowledge of past human experience.
In today’s globalised world our food tends to take a long route from farm to table, relying on international trade routes that pass through several bottlenecks. Sudden disruption of such delivery systems – via climate change or political volatility – can severely affect the food security of particular regions.
Large-scale governance is unavoidable in today’s world where hazards are regional and often transcend political boundaries, unfortunately at the moment we are relying on out of date World Organisations that are incapable of putting the Earth First!https://vimeo.com/79771046″>Climate Change — The state of the science</a> from <a href=”https://vimeo.com/anthropocene”>WelcomeAnthropocene</a> on <a href=”https://vimeo.com”>Vimeo</a>.</p>
Take a trip into the unknown.