Dating Methods – Page 7

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Dating of Impacts and Impacts of Dating

July 25, 2010

Earth and Neptune were both on stage this week with stories of impacts. How do scientists know when they occurred? Neptune: A comet struck Neptune 200 years ago. That’s what planetary scientists are claiming, according to National Geographic. The data only “suggests” this explanation, according to Space.com. Since nobody witnessed the impact in 1810 (Neptune […]

Fossils

Scratching Heads With Imaginary Stars

July 21, 2010

It was lurking out there, astronomers said. Our sun’s evil companion, invisible, dark, like a stealthy general of an enemy force, wandered silently in hiding, waiting for the next opportunity to order its agents of death into combat. Its name was Nemesis. Every 27 million years, using its gravity, it sent comets from the Oort […]

Early Man

Tricks to Preserve Deep Time

July 15, 2010

It’s not always easy to prove that things are very, very old. After all, no one has ever experienced deep time (millions and billions of years). The key is to maintain a public “feeling” in the oldness of things. Once that feeling is in place, some pretty major tweaks can be made by the experts […]

Physics

Breaking Up an Ice Age Is Hard to Do

July 1, 2010

“Ice Age 3” the movie is out, and the subject of ice ages deserves some attention. Atmospheric scientists and geologists seem very confident sometimes about things they know about only indirectly, like ice ages. At other times, though, the rhetoric turns diffident (opposite of confident). Take this opening paragraph from PhysOrg: Scientists still puzzle over […]

Uncategorized

Colorado Plateau Stumps Geologists

June 27, 2010

Many of the West’s greatest parks and scenic areas lie on the Colorado Plateau, a large basin covering parts of Arizona, Utah, New Mexico and Colorado. Within its rugged acres are the Grand Canyon, Grand Staircase, Bryce Canyon, Zion Canyon, Arches, Canyonlands, Capitol Reef, Natural Bridges, Monument Valley, Mesa Verde, Glen Canyon and Lake Powell, […]

Early Man

Lucy Gets a Date with Big Man

June 22, 2010

Another specimen of Australopithecus afarensis has been announced from Ethiopia. This one supposedly preceded Lucy by 400,000 years, and according to its discoverers, belonged to a group of primates that shows they “were almost as proficient as we are walking on two legs, and that the elongation of our legs came earlier in our evolution […]

Physics

Secular Geology Admits to Rapid Canyon Formation by Megafloods

June 21, 2010

It’s hard to deny catastrophic canyon formation when you have the evidence right in front of you. Look what happened in Texas a few years ago, as reported by PhysOrg: In the summer of 2002, a week of heavy rains in Central Texas caused Canyon Lake – the reservoir of the Canyon Dam – to […]

Solar System

Making Model Earths

June 8, 2010

Modeling how the earth got here can be fun. One doesn’t have to be right, just creative. There are certain accepted paradigms to work within, and certain accepted constraints that are taken as a given. Beyond that, there is a lot of leeway. This is illustrated by two teams who published in two different journals […]

Origin of Life

Not Life on Titan Again

June 7, 2010

Something weird is going on at the large moon of Saturn. “What is Consuming Hydrogen and Acetylene on Titan?” teased a press release from Jet Propulsion Laboratory”s Cassini mission: Two new papers based on data from NASA’s Cassini spacecraft scrutinize the complex chemical activity on the surface of Saturn’s moon Titan. While non-biological chemistry offers […]

Geology

Mt. St. Helens Recalls Overturned Paradigms

May 18, 2010

The eruption of Mt. St. Helens in May 1980 not only eroded mountains and canyons, it caused earthquake shifts in geological paradigms.

Origin of Life

Titan Continues to Surprise Saturn Scientists

May 16, 2010

Since reaching Saturn in 2004, the Cassini spacecraft has now made 68 flybys of Titan, the large smog-shrouded moon. Space.com highlighted a recent picture showing the rings appearing to bisect the moon. What are some of the latest findings of this alien world – the only moon in the solar system with a substantial atmosphere? […]

Fossils

More Pow in the Cambrian Explosion

May 11, 2010

Scientists have found more fossil evidence for sudden emergence of animal body plans in the Cambrian strata. Two papers in Geology discuss evidence on opposite sides of the world. One team found bryozoans in Mexico 8 million years older than the record-holders in China,1 and another scientist found diverse echinoderms in Spain dating from the […]

Birds

Archaeopteryx Fossil Retains Original Soft-Tissue Material

May 10, 2010

We are usually told that fossils involve the complete replacement of original living material by rock, except in rare cases (such as amber), because organic material is quickly destroyed. One of the most famous rock fossils is Archaeopteryx, the bird that has often been claimed to be a missing link from dinosaurs. An international team […]

Early Man

Humans and Neanderthals Are One

May 8, 2010

If Neanderthals bred with modern humans, they are one and the same species. That must be the case according to the most widely-accepted definition of a species: those who can breed and produce fertile offspring. The news media are abuzz with Science magazine’s cover story this week, “The Neanderthal Genome.”1 Most anthropologists are now accepting […]

Solar System

Venus May Be Hot with Active Volcanoes

April 13, 2010

We already know Venus is hot from its suffocatingly dense atmosphere, but additional heat could be coming from underground. Results from the European Space Agency’s Venus Express orbiter suggest that volcanoes have erupted any time between now and 2.5 million years ago, a “geologically recent” time compared to the assumed age of the planet (4.5 […]

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