Is There Life On Earth?

Does life exist on other planets besides Earth? Has extraterrestrial life visited Earth recently or in our distant past? The notion of extraterrestrial life is a very intriguing subject possibly for as long as mankind has looked into the vast heavens gazing at the stars. Can one say that life on Earth was done by Mother Nature which some call evolution? Is life on Earth the result of creation or alteration by a higher power or being? Some people do believe that other forms of life except those on Earth do exist. Others consider it false because there is no absolute proof beyond doubts. There have been countless occurrences by individuals around the world of either being contacted or abducted by alien life forms. Many unofficial accounts describe the Earth as being visited by one or more alien species. These various alien species that possibly visited Earth may be interested in observing the development of the human species.

Throughout history humanity has been fascinated by the existence of extraterrestrial life. Today such ventures are in the development process and the discovery of life beyond our solar system, no matter how primitive, may soon become a huge(important?) scientific breakthrough. The three basic things that are required to consider a place even remotely habitable are water, a source of energy, and organic materials. Habitability also depends on other factors that must also be taken into consideration such as how close the planet is to its star (in the case of our solar system, the sun), how long the water and organic materials existed there, and the size and mass of the planet. One must not confuse habitable with inhabited. The term

Life, it might be argued, is the distinguishing feature of all organisms and may most usefully be thought of as involving various kinds of complex systems of organization providing individual organisms with the ability to make use of those energy sources available to them for both self maintenance and reproduction. Underlying this deceptively persuasive definition, however, lie those persistent traditional problems inherent in the search for an essential, distinctive substance characteristic of all forms of life. Additionally, as evolution theory makes clear, there is the problem of borderline instances, organisms of which it is not easy to say whether or not they may be defined as being alive. One such case

To make sense of this world, you must possess your own viewpoints, perspectives, or beliefs because every individual is different. Some people ask,” why do we exist on Earth?” Others ask, ”Is there intelligent life in our solar system?” No matter what religion or belief you have, no one will really know the true answer to this question.

Life exists in itself - there is no inherent meaning attached to life. However - as all human beings (and animals) wish for

Most astronomers and scientists seem firmly convinced of this fact. Although there is not any direct (or even indirect) evidence to support these claims that other sentient life is sharing the universe with us. However, this lack of evidence showing that extraterrestrial life forms exist is not proof that they do not exist. It just does not seem logical that our planet is the only place where life and intelligence could have developed. The odds are billions against life of some form being unique to the Earth only. The Earth is unimportant in the grand scale of things in the galaxy. By this I am referring to its' size and position in the universe. In fact, the American Association for the Advancement of Science suggests that the true question that we should be

The universe is too massive to describe in words, and is always expanding, mars could have once held life, and NASA has already discovered other habitable planets. There is no reason to scoff at the notion of alien life, the facts are too numerous, but we always need more. More discoveries and theories to keep the dream alive, that's why people should be more invested in space exploration, problems we have on this planet could have solutions on others. The universe could hold answers to questions we haven't asked, and to those queries we have, it's just a matter of whether or not we’re ready for

The reigning question that ponders the minds of many individuals is “How did all life on Earth Begin”? A simple question, yet it exceeds all possibilities of theorized responses. Biologist, Charles Darwin conducted the Theory of Evolution, in which he states that all life on Earth has a common ancestor and has descended with modification through the process of natural selection. Natural selection occurs when two mates produce offspring, and through this process many subdividers are introduced, such as sexual selection, genetic drift, gene flow, and mutations that each affect the size of a species population.

What is life? A question that sounds simple, but in reality is more complex and could be answered in multiple ways. The focus of this will be comparing asexual versus sexual reproduction. Also, the evolution and adaptation versus response to environment. And lastly, but not any less important is homeostasis.

A glance in the Merriam Webster English dictionary offers twenty definitions for the word “life.” These range in scope from theological context “spiritual existence transcending physical death” (Life 4) to the obvious “the period from birth to death” (Life 5a), but all assume the reader already understands what form life takes and its qualities. In response to these assumptions, there must be an objective definition of life that establishes what features and qualities all things considered alive possess. This definition should concisely determine what differences exist between a tree and a wooden door that results in the first being alive and the latter inanimate. Ultimately, this distinction is contingent on three categories of qualities: energy, reproduction, and molecular makeup.

Many scientist keep discussing the one question that we have all been asking for centuries. Is there life on other planets? With all the data samples we have detected and investigated we still don't have an answer for this mystery question. This has left people questioning another set of questions as well, such as Do you think we will ever find life on other planets, What will that life look like, and Where might we find it? To answer the first question, we have hope and technology that is helping us try to explore different life forms that could be out there. While many people picture aliens we see popping up as a popular culture icon or even on T.V, that’s not how they probably look. The life form may not even be in

When someone thinks about “life”, he or she may think of humans, animals, plants, or anything that may breathe. From a biological perspective, life is not only made from breathing. Life is created from many different levels that when all comes to end, makes the biosphere. From smallest to largest, the Hierarchy of Structural Organization will be explained. Atoms are the smallest particle that is still considered an element. Atoms are composed of subatomic particles, which include electrons, protons, and neutrons. At the chemical level, atoms are combined together which make molecules. The human body contains four “macromolecules” which are molecules that contain a high number of atoms. The macromolecules are carbohydrates, lipids, proteins, and nucleic acids. The cellular level contains cells, which can be eukaryotic or prokaryotic. The cells make up what we call tissues. A tissue is a collection of cells

Our solar system consists of 8 planets and three dwarf planets. Of those planets, only Earth has shown signs of life. Although Venus has the same mass, density, and size as Earth, it does not show those same signs of life. Instead, Venus’s drastically different atmosphere makes it unable to sustain life in the same manner as Earth. By delving into these differences, one can come to understanding of what makes life impossible, and how life would have to evolve in order to be able to sustain itself on the planet, Venus.

Firstly, we will look into the idea of life on other planets, but before we can look at life on other planets we must look at the composition of life in our modern world. Google defines life as “a

The definition of life is ambiguous since scientists cannot reach a definition that incorporates a concrete set of factors that can accurately encompass every form of life. However, according to Andrew Knoll, the Fisher Professor of Natural History, there are three primary groupings of life. These classifications of life