Category: Science

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An Australian Zircon Crystal is 4.4 Billion Years Old

"We weren't expecting to find a sample at 4.4 billion because our prejudice said that the earliest part of the earth was so violent that no samples would be preserved.Now, we realize that is not correct."

- Prof. John Valley, Geologist, University of Wisconsin, Madison

Tiny zircon crystal that uranium and lead isotopes indicate was formed on earth 4.4 billion years ago. BSE on left is Back Scattered Electrons which concerns average density of crystal. Three black areas are inclusions of quartz which indicates the crystal was created in continental surface crust. CL on right is Cathode Luminescence. Photograph courtesy of geologist William H. Peck.
Tiny zircon crystal that uranium and lead isotopes indicate was formed on earth 4.4 billion years ago. BSE on left is Back Scattered Electrons which concerns average density of crystal. Three black areas are inclusions of quartz which indicates the crystal was created in continental surface crust. CL on right is Cathode Luminescence. Photograph courtesy of geologist William H. Peck.

January 14, 2001  Madison, Wisconsin - Another surprising find on earth is revolutionizing thinking about what the earth was like at its beginning. For the past fifteen years, geologists have been studying very ancient rock outcroppings in the Australian outback at a place called Jack Hills several hundred kilometers northeast of Perth.

 

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Dinosaur-Killing Asteroid Punched 22 Miles Through Earth’s Entire Crust

Red circle represents the Chicxulub impact crater in northwestern Yucatan peninsula produced by the violent impact of an object about 6 miles (10 kilometers) wide when dinosaurs were alive on the earth 66 million years ago. Asteroid, or comet, it punched through 22 miles of the earth's crust and is thought to be the extinction event that annihilated more than 75% of all earth life. Map courtesy of marine geophysicist Gail L. Christeson.
Red circle represents the Chicxulub impact crater in northwestern Yucatan peninsula produced by the violent impact of an object about 6 miles (10 kilometers) wide when dinosaurs were alive on the earth 66 million years ago. Asteroid, or comet, it punched through 22 miles of the earth's crust and is thought to be the extinction event that annihilated more than 75% of all earth life. Map courtesy of marine geophysicist Gail L. Christeson.


January 7, 2001  Austin, Texas - Sixty-six million years ago more than 75% of all living earth creatures died. It was the end of a warm period called Cretaceous and the beginning of another named Tertiary. At that "K-T boundary," as scientists call it, there was a major, worldwide change that exterminated the dinosaurs. Experts have argued about the cause of the global extinction for at least two centuries. Twenty years ago physicist Luis Alvarez and his geologist son, Walter, reported the discovery of a worldwide layer of clay that has a high iridium content right at the K-T boundary layer in the earth's crust. Iridium is rare on earth, but abundant in some comets and asteroids, so the Alvarez team theorized that a comet or large asteroid must have hit the earth. When scientists looked for the greatest concentration of iridium, the data took them to the northwestern corner of the Yucatan peninsula in the Gulf of Mexico. There they found the massive 60-mile wide underwater crater called Chicxulub now thought to be the impact site.

 

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U. S. Will Attempt First Landing On Asteroid Eros

This color image of Eros was acquired by NEAR's multi-spectral imager on February 12, 2000 at a range of 1100 miles (1800 kilometers). The color is close to what the unaided human eye would see. The butterscotch hue is typical of a wide variety of minerals thought to be major components of asteroids such as Eros. Photograph courtesy of Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland
This color image of Eros was acquired by NEAR's multi-spectral imager on February 12, 2000 at a range of 1100 miles (1800 kilometers). The color is close to what the unaided human eye would see. The butterscotch hue is typical of a wide variety of minerals thought to be major components of asteroids such as Eros. Photograph courtesy of Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland

January 6, 2001  Laurel, Maryland - NASA said OK this week to America's and the world's first attempt to land on an asteroid - or at least touch down briefly. Scientists on the Near Earth Asteroid Rendezvous (NEAR) team at Johns Hopkins University's Applied Physics Laboratory in Laurel, Maryland have been controlling NASA's NEAR Shoemaker spacecraft orbiting the asteroid Eros since February 14, 2000. Now, nearly one year to the day on February 12, 2001, NEAR's rocket engines will be turned on to slow the orbiter's descent toward Eros at about 7 miles per hour.

 

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Top Trends 2001

December 31, 2000  Rhinebeck, New York - As 2000 comes to an end and the true first year of the 21st Century begins, The Trends Research Institute in Rhinebeck, New York has released its list of Top Trends for 2001 and beyond. They include: Ugly Americans, Recession Proofing, Peace Talks on the Drug War, Immigration issues, Closed Minds, Involuntary Simplicity, Re-Unionizing of the Soviet Union and Corporate Dumbsizing, Round 2.

 

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Martian Bacteria?

"The presence of prismatic magnetites in Martian meteorite ALH84001 is strong evidence for life on early Mars."

- Kathie Thomas-Keprta, Biochemist,
Johnson Space Center, Houston, Texas

Mars by Hubble Space Telescope on June 30, 1999.
Mars by Hubble Space Telescope on June 30, 1999.


December 24, 2000  Houston, Texas - Three Christmases from now on December 26, 2003, a spacecraft built by the British called "Beagle 2" is scheduled to land on Mars to look for life. The lander will use a robotic arm to burrow into soil and under rocks. Samples will be analyzed chemically and results transmitted back to earth. What are the odds that Beagle 2 finds traces of organic life?

 

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Immortal Human Skin Cells – A Miraculous Answer for Burn Victims?

Could skin cells that do not die at the University of Wisconsin, Madison, provide a better and unlimited skin supply for burn victims? Healthy skin supply is limited, demanding experiments such as this film seeded with autologous keratinocyte skin cells to repair a burned shoulder. Photo: Lyons Burn Centre, Edouard Herriot Hospital, Claude Bernard University, Lyons, France.
Could skin cells that do not die at the University of Wisconsin, Madison, provide a better and unlimited skin supply for burn victims? Healthy skin supply is limited, demanding experiments such as this film seeded with autologous keratinocyte skin cells to repair a burned shoulder. Photo: Lyons Burn Centre, Edouard Herriot Hospital, Claude Bernard University, Lyons, France.

December 17, 2000  Madison, Wisconsin - In a week, it will be Christmas - a holiday to celebrate the birth of the man named Jesus Christ long considered by many to be divine, even immortal. The New Testament says his disciples heard Christ tell them that "whosoever believeth in Him who sent me shall have ever lasting life." As if to prove the lesson of his words, he also told the disciples that he would die before them and then resurrect with new life to walk among them again.

 

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A Pleiadian Star Tears Apart Black Interstellar Cloud

An black interstellar cloud is being destroyed by strong radiation from a nearby hot star named Merope in the Pleiades. Hubble telescope photograph courtesy NASA, The Hubble Heritage Team, George Herbig and Theodore Simon, Institute for Astronomy, University of Hawaii.
An black interstellar cloud is being destroyed by strong radiation from a nearby hot star named Merope in the Pleiades. Hubble telescope photograph courtesy NASA, The Hubble Heritage Team, George Herbig and Theodore Simon, Institute for Astronomy, University of Hawaii.

December 14, 2000 Hubble Space Telescope - In this new Hubble image, the star Merope in the Pleiades cluster is just outside the frame on the upper right. Not far away in astronomical terms is a cloud of dust and gas referred to as "Barnard's Merope Nebula," or IC 349. The cloud is being destroyed by the passage of Merope. NASA says the beautiful and eerie light effect is produced "like a flashlight beam shining off the wall of a cave. The star is reflecting light off the surface of pitch black clouds of cold gas laced with dust. These are called reflection nebulae." The parallel wisps extending from the lower left to upper right are explained by University of Hawaii astronomers, George Herbig and Theodore Simon, as dust particles slowed down by the strong starlight. Physicists call this phenomenon "radiation pressure."

 

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Bacteria from Outer Space?

Example of comet is Hale-Bopp © March 6, 1997 by Dean Ketelsen, Tucson, Arizona.
Example of comet is Hale-Bopp © March 6, 1997 by Dean Ketelsen, Tucson, Arizona.

December 3, 2000  Europe -

Mad Cow Disease Spreading in Europe

Mad Cow Disease continues to panic Europe. Several countries including England, Spain, Germany, Portugal, Belgium, Switzerland and The Netherlands have all reported the fatal disease. The European Union's agricultural minister told reporters, "Mad cow disease knows no borders, but is moving from one member state to another."

 

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Hubble Telescope Solves Puzzle of Stephan’s Quintet of Galaxies

Hubble Space Telescope image of Stephan's Quintet center where three galaxies are colliding 270 million light years from earth. The partial galaxy image at the bottom of the frame is now seen to be a much closer galaxy only 35 million light years away. Photograph courtesy European Space Agency and NASA.
Hubble Space Telescope image of Stephan's Quintet center where three galaxies are colliding 270 million light years from earth. The partial galaxy image at the bottom of the frame is now seen to be a much closer galaxy only 35 million light years away. Photograph courtesy European Space Agency and NASA.

November 26, 2000  Madrid, Spain - Galaxies in collision have fascinated scientists since 1877 when French astronomer Edouard Stephan discovered the first cluster that became known as Stephan's Quintet. The name applied to a group of five galaxies (NGC7317, 7318A, 7318B, 7319 and 7320) about 270 million light-years from earth in the constellation Pegasus. A sixth galaxy, NGC7320C, shown at the bottom of the above photograph, was originally thought to be part of the colliding cluster of galaxies. When its red shift (increasing wavelength emitted by receding celestial bodies) was measured in 1961, it was moving away from earth much more slowly (800 km/second) compared to the other galaxies (6000 km/second). That puzzling and discordant measurement provoked some scientists to argue that red shift is not related to distance and that the universe was not expanding.

 

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Great Pyramid At Giza – Star Alignment Might Determine Age

Great Pyramid of Khufu or Cheops located across the Nile River about six miles west of Cairo, Egypt in an area called the Giza Plateau. The pyramid is 481.4 feet high, contains an estimated 2,300,000 carved stones, each estimated to weigh an average 2.5 tons. Photograph © by Steve Beikirch.
Great Pyramid of Khufu or Cheops located across the Nile River about six miles west of Cairo, Egypt in an area called the Giza Plateau. The pyramid is 481.4 feet high, contains an estimated 2,300,000 carved stones, each estimated to weigh an average 2.5 tons. Photograph © by Steve Beikirch.

November 19, 2000  Cairo, Egypt - This week a Cambridge University Egyptologist from England, Dr. Kate Spence, announced a possible recalculation on the age of the Great Pyramid of Khufu or Cheops on the Giza Plateau near Cairo. She wanted to know how the ancient Egyptians lined up the Cheops pyramid so precisely north to south. She hypothesized that stars were the guide, so she used a computer to wind back time in the sky from today to about 4500 years ago. Dr. Spence found that the star Mizar, in the Big Dipper's handle, and Kochab, in the bowl of the Little Dipper, would have appeared one over the other at a point directly above the North Pole. Dr. Spence thinks that the Egyptians then hung a plumb line against the two stars to find true north for the construction of the great Cheops Pyramid. Her revised date for that construction is now 2478 B. C., give or take five years. If correct, the Great Pyramid could be 75 years older than traditional estimates.

 

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