Charles Darwin & Evolution. ‘Probably all the organic beings which have ever lived on this earth have descended from some primordial form, into which life was first breathed’ This is all Darwin says in The Origin of Species about the origin of life. When the public is asked about what problems they think face evolutionary theory one subject that comes up quite often is the origin of life.
Evolution, they say, does not explain how life began, therefore there must be something wrong with evolution. When people say this they are partly correct: evolution does not explain how life began. But that is not the aim of Darwinian evolution; all natural selection requires to work is that there is life, variability and competition. Criticising evolutionary biology for not explaining how life began is like criticising the kettle for not making good toast.
Some Warm Little Pond ‘But if (and Oh! Darwin had actually hit the nail on the head, the origin of life is a problem for chemistry and biochemists. Get your coat. The Birth of the Earth & Beginning of Life on Earth. KidsBiology.com - Biology For Kids. How Was The Earth Created? Hello Earth - Origins of Our Planet Where did the Earth come from? This is an important question. A question that helps us understand our own origin as a race of sentient, thinking beings. Did the Earth always exist? Has our planet spent eternity orbiting the Sun, quietly unchanging? Has the Earth always looked like it does today, with the same mountains, streams, lakes, forests, and oceans? Or does the Earth change over time? These are difficult questions to answer. History of Earth. Artistic concept of the primordial Earth when it was much hotter and hostile to life The history of Earth concerns the development of the planet Earth from its formation to the present day.[1][2] Nearly all branches of natural science have contributed to the understanding of the main events of the Earth's past.
The age of Earth is approximately one-third of the age of the universe. An immense amount of biological and geological change has occurred in that time span. The first life forms appeared between 3.8 and 3.5 billion years ago. The earliest evidences for life on Earth are graphite found to be biogenic in 3.7-billion-year-old metasedimentary rocks discovered in Western Greenland[3] and microbial mat fossils found in 3.48-billion-year-old sandstone discovered in Western Australia.[4][5] Photosynthetic life appeared around 2 billion years ago, enriching the atmosphere with oxygen. Earth's history with lengths of the eons to scale Geologic time scale[edit] Millions of Years [edit] BBC Earth - Timeline - The Earth formed from a vast gas and dust cloud. Origins of the Universe, Big Bang Theory Information, Big Bang Facts, News, Photos -- National Geographic.
The most popular theory of our universe's origin centers on a cosmic cataclysm unmatched in all of history—the big bang. This theory was born of the observation that other galaxies are moving away from our own at great speed, in all directions, as if they had all been propelled by an ancient explosive force. Before the big bang, scientists believe, the entire vastness of the observable universe, including all of its matter and radiation, was compressed into a hot, dense mass just a few millimeters across. This nearly incomprehensible state is theorized to have existed for just a fraction of the first second of time. Big bang proponents suggest that some 10 billion to 20 billion years ago, a massive blast allowed all the universe's known matter and energy—even space and time themselves—to spring from some ancient and unknown type of energy.
Scientists can't be sure exactly how the universe evolved after the big bang. Origins of the Theory. The Universe. This picture shows the overall structure of our universe. This is just a small piece, but it is enough to see that matter is organized in strands, or strings. Lets start from the beginning. The Earth revolves around the Sun. The Sun in turn revolves or circles the center of the galaxy. Now here is where it gets fun. Millions of galaxy clusters around the universe are strung together like a spiderweb.
If you could look at the entire universe at once it would look like a giant spiderweb, made up of billions of galaxies, and trillions and trillions of stars. From the Big Bang to Me. Space for Kids - Story of the Universe. GCSE Bitesize: The origins of the universe.