A Quote by Robert Jastrow
The record of the rocks contains very little, other than bacteria and one-celled plants until, about a billion years ago, after some three billion years of invisible progress, a major breakthrough occurred. The first many-celled creatures appeared on earth.
Related Quotes
Take the entire 4.5-billion-year history of the earth and scale it down to a single year, with January 1 being the origin of the earth and midnight on December 31 being the present. Until June, the only organisms were single-celled microbes, such as algae, bacteria, and amoebae. The first animal with a head did not appear until October. The first human appears on December 31. We, like all the animals and plants that have ever lived, are recent crashers at the party of life on earth.
If the age of the Earth were a calendar year and today were a breath before midnight on New Year's Eve, we showed up a scant fifteen minutes ago, and all of recorded history has blinked by in the last sixty seconds. Luckily for us, our planet-mates--the fantastic meshwork of plants, animals, and microbes--have been patiently perfecting their wares since March, an incredible 3.8 billion years since the first bacteria. ...After 3.8 billion years of research and development, failures are fossils, and what surrounds us is the secret to survival.
If we could magically transport ourselves back to the young Earth, when it was only a billion years old or two billion years old or three billion years old or four billion years old, we wouldn't be able to survive. We would have a hard time surviving if we were transported to the time when dinosaurs were around.
Most educated people are aware that we are the outcome of nearly 4 billion years of Darwinian selection, but many tend to think that humans are somehow the culmination. Our sun, however, is less than halfway through its lifespan. It will not be humans who watch the sun’s demise, 6 billion years from now. Any creatures that then exist will be as different from us as we are from bacteria or amoebae.
All indications are that three and a half billion years ago, Mars looked like Earth. It had lakes. It had rivers. It had river deltas. It had snow-capped peaks and puffy clouds and blue sky. Three and a half billion years ago, it was a happening place. The same time on Earth, that's when life started. So did life start on Mars?
There have only been about a half dozen genuinely important events in the four-billion-year saga of life on Earth: single-celled life, multicelled life, differentiation into plants and animals, movement of animals from water to land, and the advent of mammals and consciousness.
I think the Bible is completely inspired by God in its overall messages. But, for the people of those days to know what was going to happen 4,000 years later in a world of astronomy or subatomic particles. They didn't have access to the knowledge that we presently have about geology. So, we know now that the world was created many of billions of years ago, 13 or 14 billion years ago. As far as they knew, the earth was the center of the universe. They thought that stars were little twinkling things in the sky where as now we know stars are very distant and much larger than the earth.
The fossil record contains no trace of these preliminary stages in the development of many-celled organisms.
Spotify appeared nine years after Napster, the pioneering file-sharing service, which unleashed piracy on the record business and began the cataclysm that caused worldwide revenues to decline from a peak of twenty-seven billion dollars in 1999 to fifteen billion in 2013.
Sometime in the first billion years, life appeared on the earth's surface. Slowly, the fossil record indicates, living organisms climbed the ladder from simple to more advanced forms.
Nature is flexible and resilient. Nature likes redundancy and dispersion. It is approximate and deals in gradients. All boundaries are permeable. Nature nests small systems like molecules within larger systems like cells, which in turn are nested in systems called organs, organisms, ecosystems. We grew from ancient one-celled ancestors. Nature likes mergers: we contain multitudes of other life forms within us. We stand at the crest of four billion years, bacteria molded into wondrous form, burning with a slow fire and about to take the next step.
Consider: Life arose on Earth close to four billion years ago. Four billion years of slithering, swimming, and soaring life forms. But only in the last 200 thousand years has a species arisen that can fathom the laws of nature and build hardware able to signal its presence.
When we look out into space, we're looking back in time; the light from a galaxy a billion light-years away, for instance, will take a billion years to reach us. It's an amazing thing. The history is there for us to see. It's not mushed up like the geologic record of Earth. You can just see it exactly as it was.
After the earth dies, some 5 billion years from now, after it's burned to a crisp, or even swallowed by the Sun, there will be other worlds and stars and galaxies coming into being - and they will know nothing of a place once called Earth.
We're at a point in time which is analogous to when single-celled organisms were turning into multi-celled organisms. So we're the amoebas.
The Earth has been lawned with life for something over 3.5 billion years. That's a span of time great enough to encompass some honest-to-goodness catastrophe. For example, 700 million years ago, Earth underwent a planet-wide deep freeze, with ice covering the oceans from the poles to the equator.
Related Authors
Brian Tracy Quotes
American
Author
Cassandra Clare Quotes
American
Author
Frederick Lenz Quotes
American
Author
Henry David Thoreau Quotes
American
Author
J. K. Rowling Quotes
English
Author
Jodi Picoult Quotes
American
Author
John Green Quotes
American
Author
Joyce Meyer Quotes
American
Author
Marianne Williamson Quotes
American
Author
Neil Gaiman Quotes
British
Author
Richelle Mead Quotes
American
Author
Rick Riordan Quotes
American
Author
Robert Kiyosaki Quotes
American
Author
Stephen King Quotes
American
Author
Terry Pratchett Quotes
English
Author
Virginia Woolf Quotes
British
Author