Mike Adams, the Health Ranger
See article keywords and concepts |  I do support caution when it comes to possible cross-contamination between Earth and Mars, but let's realize it is this cross-contamination that is most likely responsible for seeding life on Earth, Mars, and other planets in other solar systems. comets carry the seeds of microbial life. And when comets slam into planets, those seeds are not entirely destroyed. In fact, there was a recent study showing that microbes are capable of surviving these enormous impacts that scientists once thought would kill every living thing. |
Bruce H. Lipton
See book keywords and concepts |  Unlike the others caused by galactic forces such as comets, the current extinction is being caused by a force much closer to home—humans. As you sit on your porch and watch the sunset, note its spectacular color. The beauty in the sky reflects the pollution in the air. As the world we know decays, the Earth promises us an even greater light show.
Meanwhile we are leading lives without a moral context. The modern world has shifted from spiritual aspirations to a war for material accumulation. The one with the most toys wins. |
Alex Steffen
See book keywords and concepts |  Stargazers, another popular breed of hobbyist, are aiding professional astronomers with the unmanageable task of tracking comets and asteroids. Amateurs of course delight in learning to operate their own sophisticated CCD scanner-telescopes, becoming faithful assistants who scan the sky patiently, in the cold, seeking undiscovered objects that they can name after themselves. What a deal!
Bird and bug lovers likewise perform priceless labor for ornithologists and entomologists. |
Mike Adams, the Health Ranger
See article keywords and concepts | | Life on planet Earth may have actually begun with seeds brought to the planet riding on bits of rocks and chunks of other planets or comets from somewhere else in the galaxy. And it is perhaps through such mechanisms that life spreads throughout the galaxy: a series of collisions spreading seeds of life that then, through a process of evolution and natural selection over hundreds of millions of years, end up creating more complex organisms such as insects, mammals and even human beings. | | And when comets slam into planets, those seeds are not entirely destroyed. In fact, there was a recent study showing that microbes are capable of surviving these enormous impacts that scientists once thought would kill every living thing.
As a side note, it's difficult to gain a true appreciation of the amount of energy that's released during the impact of a comet with a celestial body such as a planet. Even a small comet (5 meters wide, for example) striking a planet's surface at sufficient speed is far more powerful than a typical nuclear bomb. |
Mike Adams, the Health Ranger
See article keywords and concepts |  For example, scientists don't really have a good understanding of what comets are made of. They don't even know what the Earth is made of, or the sun. So, you may find that many of the people who believe in the secret NASA transmissions video are some of the same people that I might tend to agree with on many subjects, but not on this one. I don't see a single thing in this entire video (and I've watched it twice) that is moving in any way that couldn't be explained by the basic physics of common particles. You know, some of this could just be ice crystals. |
Sandra Ingerman
See book keywords and concepts |  Recent scientific evidence is showing that one reason for the fall of Egypt, Babylon, and Rome leading to the dark ages was due to collisions with comets or fragments of comets where the explosive energy caused dust and smoke dimming the sun, driving down temperatures, and causing famine.
In Catastrophe: A Quest for the Origins of the Modern World, British historian David Keys describes a time when the sun became dark for two years in a.d. 535, affecting all of life from California to Ireland to Siberia, decimating life in Italy, China, and the Middle East. |
Alexander Hellemans and Brian Bunch
See book keywords and concepts |  In the heavens, nothing ever changes. comets, however, appear in the heavens, last a few days or weeks, and disappear. This constitutes change. Therefore, Aristotle argued, comets are earthly stuff, not heavenly stuff, and must be some kind of spontaneous fire in the upper atmosphere. Then the comet of 1577 showed that Aristotle could not be right about the heavens.
Tycho Brahe, Michael Mastlin, and other astronomers were able to plot the comet's path. Tycho Brahe also used parallax in an effort to determine the distance of the comet of 1577 from Earth. |
Sandra Ingerman
See book keywords and concepts | | Recent scientific evidence is showing that one reason for the fall of Egypt, Babylon, and Rome leading to the dark ages was due to collisions with comets or fragments of comets where the explosive energy caused dust and smoke dimming the sun, driving down temperatures, and causing famine.
In Catastrophe: A Quest for the Origins of the Modern World, British historian David Keys describes a time when the sun became dark for two years in a.d. 535, affecting all of life from California to Ireland to Siberia, decimating life in Italy, China, and the Middle East. |
Alexander Hellemans and Brian Bunch
See book keywords and concepts | | When this happens, some of the comets fall toward the sun. A few of them might strike the Earth, causing such catastrophes as mass extinctions. Candidates for the disturbing force included passage of the solar system through the plane of the galaxy, a companion star to the sun called Nemesis, and a planet called X.
Although much of the new catastrophism is still in dispute, the idea that started it all, the impact of an object at the K-T time boundary, has gradually gained acceptance by most geologists and many paleontologists. |
James Trefil, Joseph F. Kett, and E. D. Hirsch
See book keywords and concepts |  If its path is an ellipse, it stays in orbit around the sun. fa comets were once believed to be omens, and their appearances in the sky were greatly feared or welcomed, fa The most famous comet, Comet Halley
(or Halley's comet), passes close to the earth every seventy-six years, most recently in 1986. In many of its appearances throughout history, it was an impressive sight, but for most of 1986, over most of the world, it was a very dim object in the sky. | | The orbits of the planets and of many comets are ellipses. energy In physics, the ability to do work. Objects can have energy by virtue of their motion (kinetic energy), by virtue of their position (potential energy), or by virtue of their mass. (See E = mc2.) fa The most important property of energy is that it is conserved — that is, the total energy of an isolated system does not change with time. This is known as the law of conservation of energy. Energy can, however, change form; for example, it can be turned into mass and back again into energy. | | The region of the universe near the sun that includes the sun, the nine known major planets and their moons or satellites, and objects such as asteroids and comets that travel in independent orbits. The major planets, in order of their average distance from the sun, are Mercury, Venus, the earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. solar wind A stream of particles (mostly protons) emitted by the sun and permeating the solar system. fa Particularly strong bursts of particles can penetrate the upper atmosphere and disrupt radio communications on earth. |
Alexander Hellemans and Brian Bunch
See book keywords and concepts | | Newton was the first to demonstrate that the falling of objects towards Earth's surface, the motion of the moon around Earth, the motion of planets around the sun, and the odd trajectories of the comets are all governed by one law: the law of universal gravitation.
However, the idea of universal gravitation only became clearly formed in Newton's mind in the 1680s, when he was preparing the manuscript for his Principia. He had had a first inkling of this idea some 20 years earlier. |
Thomas S. Kuhn
See book keywords and concepts |  Using traditional instruments, some as simple as a piece of thread, late sixteenth-century astronomers repeatedly discovered that comets wandered at will through the space previously reserved for the
5 Rudolph Wolf, Geschichte der Astronomie (Munich, 1877), pp. 513-15, 683-93. Notice particularly how difficult Wolf's account makes it to explain these discoveries as a consequence of Bode's Law.
6 Joseph Needham, Science and Civilization in China, III (Cambridge, 1959), 423-29, 434-36. immutable planets and stars. |
Alexander Hellemans and Brian Bunch
See book keywords and concepts | | Halley discovered periodicity of comets and proper motion of stars; he also started to map the sky as seen from the Southern Hemisphere. Cassini explored the solar system and discovered much about its planets and moons.
Biology. Better microscopes changed the view held by Descartes that living animals are relatively simple machines. His mechanistic interpretation of conception was displaced by the discovery of spermatozoa and by the discovery of the production of eggs in viviparous animals.
The transmission of characteristics proper to each species formed a fundamental problem. | | The near future of space (continued)
The Soviet Union and France plan to launch the space probe Vesta, which is scheduled to visit between ten and twenty asteroids and a couple of comets during a period of seven years.
1998 Space probe CRAF is expected to fly by asteroid Hamburga.
In December, the United States plans to launch the Mars Sample Return Mission, expected to do what its name implies. Since this is the only launch window for such a mission for a number of years, the Soviet Union plans to do the same thing. |
E. D. Hirsch
See book keywords and concepts | | If its path is an ellipse, it stays in orbit around the sun. fa comets were once believed to be omens, and their appearances in the sky were greatly feared or welcomed, fa The most famous comet, Comet Hal-ley (or Halley's comet), passes close to the earth every seventy-six years, most recently in 1986. In many of its appearances throughout history, it was an impressive sight, but for most of 1986, over most of the world, it was a very dim object in the sky. | | The orbits of the planets and of many comets are ellipses. endothermic (en-doh-THUR-mik) A descriptive term fot a chemical reaction in which heat is absorbed. [Compare exothermic) energy In physics, the ability to do work. Objects can have energy by virtue of their motion (kinetic energy), by virtue of their position (potential energy), or by virtue of their mass (see E = mc'). fa The most important property of energy is that it is conserved — that is, the total energy of an isolated system does not change with time. This is known as the law of conservation of energy. | | The region of the universe near the sun that includes the sun, the nine known major planets and their moons or satellites, and objects such as asteroids and comets that travel in independent orbits. The major planets, in order of their
Solar system. The nine major planets in the solar system in order of their distance from the sun. The asteroid belt (not illustrated) is between Mars and Jupiter. average distance from the sun, are Mercury, Venus, the earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. |
James Trefil
See book keywords and concepts |  So in the future, you can expect to see small missions to Mercury, Pluto, and Venus, and many missions to study nearby asteroids and comets, missions that may even bring samples back. And all of this will be done by a new generation of cheap, "throwaway" spacecraft.
What is the Earth Observing System? one standard criticism of the space program is that it diverts scarce brainpower and financial resources from pressing problems on our own planet. |
Rupert Sheldrake
See book keywords and concepts |  Current ones include the terrestial origin of life within a Primaeval Broth; the infection of the earth by micro-organisms deliberately sent on a space ship by intelligent beings on a planet in another solar system;12 and the evolution of life on comets containing organic materials derived from interstellar dust.13
Secondly, even if the conditions under which life originated could be known, this information would shed no light on the nature of life. |
Donald Ryan
See book keywords and concepts |  More fantastic were the engraved designs of such things as comets, stars, and Hebrew letters, including some spelling the name of God.
1 LOST Pound
Lost and Found
The great showman P. T. Barnum tried to purchase the Cardiff Giant, but his offer was refused. So he made his own and put it on display.
Beringer was impressed and published a book on the supposed fossils, in which he even considered and dismissed the possibility that they were fake. Legend has it that Beringer only learned of the hoax when he discovered a stone bearing his own name. |
Gary Zukav
See book keywords and concepts |  In this case, the mountain is the sun, the travelers are the planets, asteroids, comets (and debris from the space program), the footpaths are their orbits, and the coming of daylight is the coming of Einstein's general theory of relativity.
The point is that the objects in the solar system move as they do not because of some mysterious force (gravity) exerted upon them at a distance by the sun, but because of the nature of the neighborhood through which they are traveling.
Arthur Eddington illustrated this same situation in another way. |
Alexander Hellemans and Brian Bunch
See book keywords and concepts | | Therefore, Aristotle argued, comets are earthly stuff, not heavenly stuff, and must be some kind of spontaneous fire in the upper atmosphere. Then the comet of 1577 showed that Aristotle could not be right about the heavens.
Tycho Brahe, Michael Mastlin, and other astronomers were able to plot the comet's path. Tycho Brahe also used parallax in an effort to determine the distance of the comet of 1577 from Earth. Parallax refers to the apparent angular difference in position of an object when seen from two locations. |
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